GroupDIY

Project Specific Discussions => Filters/Equalizers => Topic started by: Marcocet on November 02, 2011, 12:14:35 AM

Title: Harrison Ford Filter Feeler
Post by: Marcocet on November 02, 2011, 12:14:35 AM
It looks like 12afael, Jens and I finally have a production version of this PCB ready and we're about to place an order for ourselves. Essentially it's a clone of the classic Harrison sweepable filters. The board runs on +/- 15v, has extremely few parts, and is tiny enough to fit a bunch in a rack case. It could also easily be built into a 500 series module. The hardest parts to source are the 47k Rev Log pots, which are available at Audio Maintenance (thanks Colin!).

I'm not trying to run a shop or anything, but if anybody would like a few boards I can figure out a price and add them in to our order. Please feel free to PM me or email me at strangeweathersound @t gmail.



EDIT:

Boards are sold out. Here's the BOM. I've attached an excel copy too for those who are that way inclined.

5   10k           R1, 2, 6, 7, 9   
4   390           R3, 4, 5, 8   

9   0.1u           C1, 2, 6, 7, 11, 12, 13, 15, 16   
1   100p           C3   
1   0.012u   C4   
1   0.047u   C5   
2   100u   C8, 9   electrolytic
1   10u           C10   electrolytic

2   50k Dual Lin   LOPASS, HIPASS   Audiomaintenance.com
1   ESWITCH 2 pole   switch   Audiomaintenance.com

1   INA134P   IC2   
1   TL074P   IC1   
1   DRV134PA   U$1   

http://strangeweatherbrooklyn.com/sales/HarrisonFilterBOM.xls (http://strangeweatherbrooklyn.com/sales/HarrisonFilterBOM.xls)


schematic here (http://strangeweatherbrooklyn.com/sales/harrisonfordfilter.jpg)
Title: Re: Harrison Ford Filter Feeler
Post by: tmuikku on November 02, 2011, 03:43:16 AM
Hi!

which pot it uses, the conductive plastic or this cheaper carbon pot? http://www.audiomaintenance.com/acatalog/om-01-028_extended_info.html

have you prototyped it already? 8) the pushbutton seems to come very close of those potis, is there room for switch cap and knobs? Just kicking the tires since I'm interested!

It seems eight will fit into 1u case?
Title: Re: Harrison Ford Filter Feeler
Post by: coriolis on November 02, 2011, 04:34:52 AM
I'm not familiar with these - are they hi/lo shelf filters with selectable freqs? Or? Got a schem or a pic of an original unit?
I'm certainly looking for something simple like this, so might be interested...

C
Title: Re: Harrison Ford Filter Feeler
Post by: mitsos on November 02, 2011, 09:59:18 AM
tmuikku,

just a guess but switch is probably on one side and pots on the other side of the PCB.  BTW, if it fits Omegs then they are ALL conductive plastic. According to their website, that's all they make.   I've even brought this up to Colin once, but didn't really understand the reason he gave me for selling them as carbon. Anyway, bottom line is that all Omegs are cond plastic.

There was another thread with info about these in the drawing board:

http://www.groupdiy.com/index.php?topic=44444.0
Title: Re: Harrison Ford Filter Feeler
Post by: okgb on November 02, 2011, 10:10:49 AM
Depending on cost , i could speculate on a board set or two
[ knowing i may have a hard time getting to them  ]
Title: Re: Harrison Ford Filter Feeler
Post by: benlindell on November 02, 2011, 01:28:42 PM
If the price is reasonable I'd love to grab up 8 of them, I can never seem to find enough highpass filters in the studio.

are the 12db/oct filters?
Title: Re: Harrison Ford Filter Feeler
Post by: Dubka on November 02, 2011, 05:19:52 PM
Yep, 8 here as well - depending on price...
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 02, 2011, 08:10:53 PM
I'm expecting them to land in the $4-5 each territory, but don't hold me to it quite yet. It all depends on how many people are interested.

Yep, they're 12db/octave filters.

Mitsos got it. Switch mounts on the bottom of the board.

I'll get together a BOM but if I remember they weren't more than $25 each in high quality parts, excluding the pots.
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on November 02, 2011, 10:36:58 PM
Hell yes!  If they're $5 a pop I'm in for at least 8.
Title: Re: Harrison Ford Filter Feeler
Post by: benlindell on November 03, 2011, 02:51:46 AM
What does the switch control, sorry if it's obvious, I just glanced at the PCB, is it a bypass for both filters or just the lowpass?
Title: Re: Harrison Ford Filter Feeler
Post by: danijel on November 03, 2011, 05:02:53 AM
I'm in for 8... :)
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 03, 2011, 12:27:09 PM
What does the switch control, sorry if it's obvious, I just glanced at the PCB, is it a bypass for both filters or just the lowpass?

Both, but it's not true bypass. If you want that you can wire it up off board.

Title: Re: Harrison Ford Filter Feeler
Post by: Denyle Guitars on November 03, 2011, 01:29:56 PM
In for 8 as well.
Title: Re: Harrison Ford Filter Feeler
Post by: jackies on November 03, 2011, 02:53:23 PM
So do we just post here, or have to email you with the desired number of boards?
It's 8 for me btw...
 :D
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 03, 2011, 03:12:51 PM
So do we just post here, or have to email you with the desired number of boards?
It's 8 for me btw...
 :D

Either one's fine :) You are now on the list. I'll close it in a week or so and contact everybody for payment.
Thanks!
-marc alan

Title: Re: Harrison Ford Filter Feeler
Post by: monkey on November 03, 2011, 11:41:21 PM
Much needed! I'm in for two.
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on November 04, 2011, 12:01:57 AM
I love the name! ;D
Title: Re: Harrison Ford Filter Feeler
Post by: detonator on November 04, 2011, 03:59:47 AM
in for 2 depending on the price
Title: Re: Harrison Ford Filter Feeler
Post by: MrZpliff on November 04, 2011, 06:27:54 AM
4 boards for me please  :)
Thank's !
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 04, 2011, 05:34:50 PM
I love the name! ;D

And I love Christopher Lloyd.

Good times.
Title: Re: Harrison Ford Filter Feeler
Post by: JayDubrek on November 05, 2011, 12:31:59 PM
Put me down for 8x boards please!
Ta
Jay
Title: Re: Harrison Ford Filter Feeler
Post by: funkymonksf on November 05, 2011, 05:59:23 PM
I'm in for 4
Title: Re: Harrison Ford Filter Feeler
Post by: envelope on November 06, 2011, 08:35:54 AM
Hello, I am in for 6 pcbs. thank you.
Title: Re: Harrison Ford Filter Feeler
Post by: Grooveteer on November 06, 2011, 08:41:55 AM
I'd like 8 boards please  :D
Title: Re: Harrison Ford Filter Feeler
Post by: tomugli on November 06, 2011, 03:01:56 PM
hi i'd like 4 boards please  8)
Title: Re: Harrison Ford Filter Feeler
Post by: Joechris on November 07, 2011, 02:23:21 AM
Im in for 2
Title: Re: Harrison Ford Filter Feeler
Post by: mik on November 07, 2011, 07:34:13 AM
two here pleaz.

Mik.
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on November 07, 2011, 10:56:17 AM
Well it seems like 8 is the way to go - put me down!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 07, 2011, 01:09:57 PM
hey Allen! How's it going man?

I'm glad so many people are interested in these. I'm planning to close orders next weekend and sometime the following week try to figure out shipping rates and start collecting cash. Don't forget to thank 12afael, he's the guy who designed these, I just prototyped them.

Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on November 07, 2011, 03:50:25 PM
It's the wrong Al! I'm Al from Tape Op in the UK. I meant to say hi at the Smooch dinner thing but it was not a great 'meet new people' venue!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 07, 2011, 04:07:09 PM
Ha. Oops. Sorry about that :)

Yeah, absolutely. That place was a crowd. Damn good dinner though. Nice to finally meet you on here!

Title: Re: Harrison Ford Filter Feeler
Post by: JayDubrek on November 08, 2011, 03:12:07 PM
Just checked out Colin Audio Maintainance website and there are several 47k rev log pots....which one would you recommend?
Thanks
Jay
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 08, 2011, 04:35:31 PM
Just checked out Colin Audio Maintainance website and there are several 47k rev log pots....which one would you recommend?
Thanks
Jay

The 16mm carbon Omegs are what I'm using, however Colin has suggested that he could order some with 1/4" shafts so they fit more knobs so I'm waiting to hear back on that. I'll let you know, and I'll post the BOM and such soon.

Title: Re: Harrison Ford Filter Feeler
Post by: MHanson on November 09, 2011, 01:29:10 AM
I suppose I'm in for 8 also ....

Thanks,
Michael
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 15, 2011, 09:49:48 AM
Awesome. Alright, one more day everybody then I'm calling this closed. If you want in now's the time!

Title: Re: Harrison Ford Filter Feeler
Post by: dissonantstring on November 15, 2011, 11:41:48 AM
o.k., o.k. i'm in for 8 boards.
thanks!
-grant
Title: Re: Harrison Ford Filter Feeler
Post by: soundsactive on November 15, 2011, 12:32:22 PM
if it's not too late i'll be in for 4!
Title: Re: Harrison Ford Filter Feeler
Post by: wolfgang on November 15, 2011, 05:36:55 PM
I am in for 2 please!!

wolfgang
Title: Re: Harrison Ford Filter Feeler
Post by: AP carrier on November 15, 2011, 06:55:14 PM
8 for me please. I've got 8 channels in need of these!

Andrew
Title: Re: Harrison Ford Filter Feeler
Post by: bigrussian on November 15, 2011, 09:02:08 PM
I'm down for 8 boards. Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 15, 2011, 09:28:08 PM
Okay, here's the list of who's in. If you want to jump in you still have until tomorrow.

okgb   2
benlindell   8
Dubka   8
Minor_Glitch   8
baadc0de   8
Danijel   8
Jackies   8
Jens   16
tmuikku   8
delaymix   16
detonator   2
MrZpliff   4
JayDubrek   8
funkymonksf   4
envelope   6
Grooveteer   8
tomugli   4
joechris   2
mik   2
TapeOpAl   8
Paul Gold   10
Reed   8
zmgwg   2
MHanson   8
dissonantstring   8
soundsactive   4
wolfgang   2
AP carrier   8
bigrussian   8


Final price will be $5 each board plus $5 domestic (US) shipping or $15 international. You can pay via paypal to strangeweathersound at gmail . I'll hit everybody up via PM as well. Thanks so much for getting involved with this! You're going to like these.

Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on November 15, 2011, 11:50:24 PM
That's $15 flat for international shipping, not $15 per board, right? 
So 8 boards plus shipping would total $55USD?
Title: Re: Harrison Ford Filter Feeler
Post by: lespaul924 on November 16, 2011, 04:32:58 AM
I am in for four boards. Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: elskardio on November 16, 2011, 12:15:32 PM
I would like 8 pcb if it's not to late...
Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: Gilbert on November 16, 2011, 01:23:11 PM
I would like to be on the list for 2 boards.
Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 16, 2011, 05:27:37 PM
Gilbert you're in. Just send over the cash


Yes, those shipping amounts are for any number of boards. For international buyers if it comes to way less when I ship them I"ll refund you the difference, but it's a lot of trouble and time to get specific quotes for everyone so if you could just send $15 for now that would be amazing, and thanks.

-marc alan

Title: Re: Harrison Ford Filter Feeler
Post by: monkey on November 16, 2011, 05:57:02 PM
I posted asking for two, but didn't make the list. Is it still possible to get in on this?
Title: Re: Harrison Ford Filter Feeler
Post by: dissonantstring on November 16, 2011, 06:23:55 PM
hi marc,
payment sent for 8 of the filter pcbs and shipping.
thanks for organizing this and for 12afael for design and allowing us to use it.
best,
grant
Title: Re: Harrison Ford Filter Feeler
Post by: bigrussian on November 16, 2011, 07:03:41 PM
Payment sent for 8+shipping.
Thanks again!
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on November 16, 2011, 09:00:24 PM
Payment sent for 8 boards and shipping.
Title: Re: Harrison Ford Filter Feeler
Post by: danijel on November 17, 2011, 03:38:10 AM
Payment sent. Thank you.
Title: Re: Harrison Ford Filter Feeler
Post by: MrZpliff on November 17, 2011, 05:29:43 AM
Payment sent  :)
Thank's !

/Magnus
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 17, 2011, 12:15:19 PM
Thanks everybody. A little over half are already paid for in just about two days. You guys are great!

Title: Re: Harrison Ford Filter Feeler
Post by: jackies on November 17, 2011, 02:12:46 PM
Payment sent 8)
Title: Re: Harrison Ford Filter Feeler
Post by: TimS on November 17, 2011, 02:34:37 PM
Are these still available? I'd like to get 8 if possible.
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 17, 2011, 07:19:13 PM
Hey Tim,

I'm going to have to put you on the backup list, but there will probably be plenty. I'll let you know as soon as I'm sure!

Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on November 17, 2011, 07:40:23 PM
Damn! If there's any more left I'd take 8 of 'em. Thanks

Ben
Title: Re: Harrison Ford Filter Feeler
Post by: wolfgang on November 18, 2011, 11:59:52 AM
Paid for 2 Boards plus Shipping!

Thanks alot!
Title: Re: Harrison Ford Filter Feeler
Post by: AP carrier on November 20, 2011, 02:37:37 AM
8 boards+shipping paid for. Great little project.
Title: Re: Harrison Ford Filter Feeler
Post by: tomugli on November 20, 2011, 02:06:30 PM
four boards plus shipping paid

many thanks for this project
Title: Re: Harrison Ford Filter Feeler
Post by: Dubka on November 21, 2011, 08:11:35 AM
payment sent for 8 boards..

Cheers!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 21, 2011, 05:25:12 PM
hey everybody

Here's a list of people I'm still awaiting payment from:

Detonator - 2
funkymonksf - 4
jaydubrek - 8
joechris - 2
mik - 2
okgb - 2
soundsactive - 4
TapeOpAl - 8
zmgwg - 2

The boards have been ordered but I don't know how the company will do over the holidays... I'll let you know as soon as I've got them in hand!




Also: Dan at Collective Cases was talking about throwing together a faceplate to mount 8 of these in 1ru. Would anybody else be interested?


Title: Re: Harrison Ford Filter Feeler
Post by: baadc0de on November 21, 2011, 05:27:39 PM
Also: Dan at Collective Cases was talking about throwing together a faceplate to mount 8 of these in 1ru. Would anybody else be interested?

YES!
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on November 21, 2011, 06:30:22 PM
Also: Dan at Collective Cases was talking about throwing together a faceplate to mount 8 of these in 1ru. Would anybody else be interested?
Absolutely.  Would 8 fit in 1u with power supply or would you need to use an external supply?  I assumed these were better suited for 2u.
Title: Re: Harrison Ford Filter Feeler
Post by: TimS on November 21, 2011, 08:21:39 PM
Also: Dan at Collective Cases was talking about throwing together a faceplate to mount 8 of these in 1ru. Would anybody else be interested?

Assuming there are enough leftovers that I can get 8 boards, I would be interested in this.
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 21, 2011, 10:11:01 PM
Also: Dan at Collective Cases was talking about throwing together a faceplate to mount 8 of these in 1ru. Would anybody else be interested?
Absolutely.  Would 8 fit in 1u with power supply or would you need to use an external supply?  I assumed these were better suited for 2u.

Well, you certainly could put the power supply in the case, but I'm planning on using an external one. I really like overbuilt power supplies. You could run them fine on a wall wart if you swing that way.


Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on November 21, 2011, 10:48:48 PM
Hey guys, glad to see interest in these.  It gives me a reason to make a case for myself!  :)

Anyway, let me know what we want for the back panel and such and I will be on it.  IEC or XLR for external PSU. In order to make them affordable we should agree on what we need and I will do a small run or what ever we quantity we need.

Also, let me know if a front panel design is wanted with silk screen or if the fact that they are simple filters just the holes are wanted? 

Hit me up with wish list.  Thanks.

Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on November 22, 2011, 07:00:18 AM
Also: Dan at Collective Cases was talking about throwing together a faceplate to mount 8 of these in 1ru. Would anybody else be interested?

Assuming there are enough leftovers that I can get 8 boards, I would be interested in this.

+1
Title: Re: Harrison Ford Filter Feeler
Post by: thebigskinny on November 22, 2011, 07:25:11 AM
Any chance I can get in on 8?
Let me know so I can send payment
Title: Re: Harrison Ford Filter Feeler
Post by: baadc0de on November 22, 2011, 08:08:44 AM
I'd definitely prefer ones that silk screened / labelled in some way.
Title: Re: Harrison Ford Filter Feeler
Post by: elskardio on November 22, 2011, 03:07:02 PM
Hey guys, glad to see interest in these.  It gives me a reason to make a case for myself!  :)

Anyway, let me know what we want for the back panel and such and I will be on it.  IEC or XLR for external PSU. In order to make them affordable we should agree on what we need and I will do a small run or what ever we quantity we need.

Also, let me know if a front panel design is wanted with silk screen or if the fact that they are simple filters just the holes are wanted? 

Hit me up with wish list.  Thanks.



Hey Dan,
a DB25 cutout would be great! I also prefer a front panel with silk screen.
Thanks for your help!



Title: Re: Harrison Ford Filter Feeler
Post by: baadc0de on November 22, 2011, 03:13:23 PM
DB25 is an excellent idea.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on November 22, 2011, 03:17:27 PM
This does seem like a good project for DB25's. So two DB25's on the back panel.  What about PSU.  Should that be IEC or a XLR for external supplies?

Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 22, 2011, 07:35:40 PM
Screw it, lets put an IEC on there. There's got to be a pretty good power supply that will run +/- 15 and fit in a 1ru case around here somewhere.

I put together a waiting list and you guys are on it.

Title: Re: Harrison Ford Filter Feeler
Post by: elskardio on November 22, 2011, 10:00:52 PM
+1 for the IEC
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on November 22, 2011, 10:39:52 PM
Yeah, IEC and two DB25s sounds like a good plan.
Title: Re: Harrison Ford Filter Feeler
Post by: baadc0de on November 23, 2011, 12:43:47 AM
peterc's green PSU, if you omit the 48V section. It comes with most s800 EQ kits. for such a small current draw I think it could even operate without heatsinks. It definitely goes into 1U (see s800 thread).
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on November 26, 2011, 11:16:07 AM
Hmmmm indeed.

Well, here's a list of who's left. I'm gonna message everyone now.


Detonator - 2
funkymonksf - 4
JayDubrek - 8
mik - 2
okgb - 2
soundsactive - 4
zmgwg - 2


Do you have a link to Peterc's psu? I couldn't find it for some spacey reason...


Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on November 26, 2011, 11:38:21 AM
Hey Guys this is what the back panel would be cut out like.

(http://dandeurloo.com//collectivecases/PDF/1U_Back_2_DB25.jpg)

I need to get some specs on the PCB's to work out a front panel layout.
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on November 26, 2011, 12:08:06 PM
Looks good!
Title: Re: Harrison Ford Filter Feeler
Post by: kquick on November 26, 2011, 04:37:26 PM
If its not to late I would like 8 of these or even 4 if I can get them

Thanks
Kim
Title: Re: Harrison Ford Filter Feeler
Post by: mik on November 27, 2011, 03:09:24 PM
money sent for 2 boards
Mik.
Title: Re: Harrison Ford Filter Feeler
Post by: JayDubrek on November 28, 2011, 03:13:04 PM
Paid via paypal for 8 boards...
Thanks!
Jay
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on December 04, 2011, 03:58:36 PM
Okay, I'm gonna close this up on tuesday night. The boards are supposed to come in this week. Here's a list of who hasn't paid. If I don't get payment by tuesday I'll open those slots up to people on the waiting list.

Detonator - 2
Soundsactive - 4

Thanks everybody!
Title: Re: Harrison Ford Filter Feeler
Post by: kramerb1 on December 05, 2011, 01:46:43 AM
I'd like to get on the waiting list for 8, please. It's just so darn hard to keep up with everything sometimes, this slipped right by me!

Thanks,

Brian
Title: Re: Harrison Ford Filter Feeler
Post by: elskardio on December 05, 2011, 10:24:47 AM
Hey Dan,

any news on the front panel design?

Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on December 05, 2011, 08:40:28 PM
Hey Dan,

any news on the front panel design?

Thanks!

Nope because I haven't gotten a chance to send him the details :)

Boards showed up today. I'm gonna throw one together tomorrow just to make triple sure they're right and then ship them out asap.
Title: Re: Harrison Ford Filter Feeler
Post by: wolfgang on December 14, 2011, 07:12:57 PM
Hello!

Any news about the progress???

regards,
Wolfgang
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on December 15, 2011, 06:15:02 PM
Yep! I built one and it was working fine on my bench. Then I took it to the studio and it wasn't working :). Then I flew to san francisco for five days and caught a nasty cold on the way back, and now I'm on the couch recovering. I'm hoping to figure out what got screwed up in transport this weekend and ship these puppies out next week. I'll let you know when as soon as I have an more info!
Title: Re: Harrison Ford Filter Feeler
Post by: wolfgang on December 15, 2011, 06:23:51 PM
I dont know how to say " I wish you the best to get healthy soon!" correct in english, but i wish you.......!!

regards,
Wolfgang
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on December 15, 2011, 07:55:41 PM
I dont know how to say " I wish you the best to get healthy soon!" correct in english, but i wish you.......!!

regards,
Wolfgang

As an English man, that will do fine :)

Keep us posted Marc, good work on the testing!
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on December 15, 2011, 10:59:14 PM
Yep! I built one and it was working fine on my bench. Then I took it to the studio and it wasn't working :). Then I flew to san francisco for five days and caught a nasty cold on the way back, and now I'm on the couch recovering. I'm hoping to figure out what got screwed up in transport this weekend and ship these puppies out next week. I'll let you know when as soon as I have an more info!
Did you plug it in? ;)

hahaha kidding.  My day job is in technical support.  You'd be amazed how many times the answer is "Oh, you have to plug it in?"  Always tempted to respond with "noooo you don't have to plug it in, there's 120V flowing through the coax line to your cable box" *facepalm*
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on December 23, 2011, 07:47:15 PM
It's alive!!

As I thought I fried the ICs in transport. That's what I get for throwing the thing uncovered in the top case of my scooter.

Anyway it sounds awesome. I've added the BOM information to the first post. They should be shipping out this week. It'll be a merry christmas!

Also I finally send the layout info to Dan at collective cases, so we should have a rack kit in the works some time in the new year.

Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on December 25, 2011, 08:12:10 AM
Good news Marc!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on December 28, 2011, 09:02:56 PM
And they've shipped!

I don't think there are going to be any spares. Basically I'm deciding if I need to keep 32 or if I can let some of them go :) I'll hit up the wait list if I decide to liquidate some of them.

-marc alan
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on December 29, 2011, 06:08:00 AM
Woohoo!

I'll keep an eye out for the postman. Although I feel sorry for those who haven't ordered I LOVE the idea of having 32 ch for your console. You thinking about some kind of penthouse or some way of actually putting them physically aligned with the channels or just having them in the rack?
Title: Re: Harrison Ford Filter Feeler
Post by: monkey on December 30, 2011, 03:10:38 PM
Is there a schematic?

thx!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on December 30, 2011, 08:49:24 PM
Is there a schematic?

thx!

of course. Added to the first post.
Title: Re: Harrison Ford Filter Feeler
Post by: Grooveteer on December 31, 2011, 07:27:32 AM
Received mine today. That was fast! 

Thanks again!
Title: Re: Harrison Ford Filter Feeler
Post by: danijel on January 02, 2012, 08:33:56 AM
Got it!

Thanks again!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 02, 2012, 11:02:53 AM
Man, US postal service must be on the ball!

Glad they came in safe. Let me know how you like them!
Title: Re: Harrison Ford Filter Feeler
Post by: MrZpliff on January 02, 2012, 02:21:57 PM
Boards arrived today. Thank's !  :)
Title: Re: Harrison Ford Filter Feeler
Post by: wolfgang on January 02, 2012, 03:08:15 PM
Boards have arrived!
Thanks!

Wolfgang
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 03, 2012, 11:08:58 AM
Hey Guys here is the front panel Marc and I have worked out.  I need to know how many and who wants them so I can get an idea how many to make up.  Please let me know.

(http://www.collectivecases.com/images/Front%20Panel%20Photos/1-space-faceplate-Harrison-Filters2.jpg)
Title: Re: Harrison Ford Filter Feeler
Post by: dissonantstring on January 03, 2012, 12:49:03 PM
hi marc,
the pcbs i ordered arrived safely a few days ago.  thanks for organizing this GB and thanks to 12afael for the pcb design. 
cool little project!

dan, not sure how i am going to implement this board yet, but feeling interested in the panel.  can you give an estimate of the cost and is this for only the panel or the entire chassis with custom panel like your other offerings?

best regards,
grant

edit:  oops!  corrected 12afael's name.  sorry. :-[
Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on January 03, 2012, 12:59:36 PM
I'm in for one Dan, many thanks.

That front panel is a knockout, check out the cool-as logo! I haven't even got any boards but feeling optimistic.. sour grapes to have missed curfew on these. Awesome project, totally useable and unique around here as far as I'm aware. Marc sorry to be a PITA, but any likelihood of a 2nd run, like Harrison Ford and the Filter of Doom? Boom cshh..  anyway, happy new year and good luck to you all on your builds.

Ben
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 03, 2012, 01:01:20 PM
It will be a complete case and panel.  135 USD

Seems like most everyone wants the back panel to be DB25's and an IEC and ground hole. 
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 03, 2012, 01:14:44 PM
Oh.. I'd like a couple of boards. But, it's no one left right? Or right left? :)
Just what I've been looking for.

Anyone having a couple extra to sell?
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 03, 2012, 01:26:18 PM
I think I may be able to sell some boards along with the cases if Marc doesn't have time to make any more up.  More details to come.
Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on January 03, 2012, 01:40:41 PM
That's very welcome news Dan, not to be overly forward but I'm uber keen on 8 if you got 'em. Kudos once again on the panel, lovely work!
BTW, is that red spot on the right hand side for a pilot light or just part of the silkscreen? No bother either way, just curious.

ben

Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 03, 2012, 01:42:20 PM
yeah its a "mock" power light. 

Marc is gonna test fit one of them soon and then I will get started on the process of making these babies.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 03, 2012, 02:19:19 PM
I think I may be able to sell some boards along with the cases if Marc doesn't have time to make any more up.  More details to come.
Good news  8)
I'll only need the boards - 2x
Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on January 03, 2012, 02:36:00 PM
Quote
yeah its a "mock" power light. 
Ahh perfect! There's a little red sun next to the clouds and thunder bolts! Thanks for the info Dan, I'll stay posted.

Ben
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on January 03, 2012, 05:31:13 PM
Quote
hi marc,
the pcbs i ordered arrived safely a few days ago.  thanks for organizing this GB and thanks to 12fael for the pcb design.
cool little project!

haha now I know where is the hole in my name  ::)
Title: Re: Harrison Ford Filter Feeler
Post by: dissonantstring on January 03, 2012, 05:58:13 PM
oops!  corrected the spelling.  sorry about that 12afael!
thanks for the project!

haha now I know where is the hole in my name  ::)

 ;D
Title: Re: Harrison Ford Filter Feeler
Post by: reedblack on January 04, 2012, 12:06:50 AM
Hi Dan! I just got 8 pcb's from Marc -- I would love to get the face plate and chassis too. Sign me up! ;)
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 04, 2012, 04:06:52 AM
I don't think there are going to be any spares. Basically I'm deciding if I need to keep 32 or if I can let some of them go :) I'll hit up the wait list if I decide to liquidate some of them.

-marc alan
Pleace, add me to the wait-list, if Dan Deurloo is not selling some of his boards separate. (DD: Are you?)
Title: Re: Harrison Ford Filter Feeler
Post by: jensenmann on January 04, 2012, 04:40:59 AM
PCBs arrived here, too. Thanks Mark, thanks Rafael!!!!!

Dan, will you do the frontpanel only or will it be the entire case?
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on January 04, 2012, 09:46:57 AM
Boards landed here in UK today!

Dan, due to shipping costs I'd be interested in a front panel if they can be fitted to standard enclosures we can buy over here?

Anyone doing a build diary or got into building already?

Any suggestions for EU power supply? Have been thinking about taking the lazy option and using a Traco switched mode...
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 04, 2012, 10:47:38 AM
I sell my custom projects as full case and front panel. I do have a little different mounting spacing then everyone else.  It just kind of happened that way with the design of my chassis because I have done my best to maximize the inside usable space.  So my panels only work on my chassis.  Sorry.  Plus I would have no idea how to price front panels only.

I do think (biased) even with shipping overseas its probably still worth it since all the back panel holes will be cut as well.  If you are interested in shipping cost send me your full address and I can get you a pretty good estimate to what shipping will be.

Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: tomugli on January 04, 2012, 01:11:39 PM
boards arrived in leicester uk today.

many thanks  :)
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on January 04, 2012, 04:54:40 PM
Boards arrived today  :)
Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 04, 2012, 05:29:26 PM
Looks like there are 3 versions of pots Colin sells.  Which one are you guys using?

OM-01-028 or RU-01-022 or OM-01-029?

UPDATE:
This is the one Marc recommends.
http://www.audiomaintenance.com/acatalog/om-01-028_extended_info.html



Also, for the bypass switch is it AL-03-001 or AL-03-002?  I'm honestly not sure if it matters as long as they are 2 POL and latching.

Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on January 04, 2012, 08:12:33 PM
Quote
PCBs arrived here, too. Thanks Mark, thanks Rafael!!!!!

thanks to you too Jens , you too were part of the team!
I want to see some on the rack students next time haha ;)
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 05, 2012, 04:05:51 AM
The:
2   50k Dual Lin   LOPASS, HIPASS   Audiomaintenance.com
I'm not finding it at audiomaintainace.. What's the correct component?

http://www.audiomaintenance.com/cgi-bin/ss000001.pl?page=search&PR=-1&TB=A&SS=dual+lin&ACTION=quick+search
Title: Re: Harrison Ford Filter Feeler
Post by: MrZpliff on January 05, 2012, 06:24:23 AM
The:
2   50k Dual Lin   LOPASS, HIPASS   Audiomaintenance.com
I'm not finding it at audiomaintainace.. What's the correct component?

http://www.audiomaintenance.com/cgi-bin/ss000001.pl?page=search&PR=-1&TB=A&SS=dual+lin&ACTION=quick+search

I think it's this one:
OM-01-028 - 16mm - 2 gang 47k rev. log
Part Code: OM-01-028
It's listed as 50k LIN in the BOM, but from what I know a rev.log works better in this application.

I'm also wondering wich switch to use. Is it this one ?:
AL-03-002 - 2 Pole Changeover Switch (PCB Mount) - Latching Miniature
Part Code: AL-03-002 ??
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 05, 2012, 12:50:22 PM
The:
2   50k Dual Lin   LOPASS, HIPASS   Audiomaintenance.com
I'm not finding it at audiomaintainace.. What's the correct component?

http://www.audiomaintenance.com/cgi-bin/ss000001.pl?page=search&PR=-1&TB=A&SS=dual+lin&ACTION=quick+search

I think it's this one:
OM-01-028 - 16mm - 2 gang 47k rev. log
Part Code: OM-01-028
It's listed as 50k LIN in the BOM, but from what I know a rev.log works better in this application.
Ok, thanks! (Don't know about that switch)
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 05, 2012, 03:58:39 PM
Yep. Dual 47k or 50k rev log. The board is sized for: http://www.audiomaintenance.com/acatalog/om-01-028_extended_info.html (http://www.audiomaintenance.com/acatalog/om-01-028_extended_info.html)
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on January 05, 2012, 05:21:11 PM
Anyone know the current draw per board? I have a lot of newbie questions btw :)

Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 05, 2012, 08:24:31 PM
marc, which switch did you use for the bypass? 
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 06, 2012, 07:52:11 PM
marc, which switch did you use for the bypass?

http://www.audiomaintenance.com/acatalog/AL-03-001_extended_info.html (http://www.audiomaintenance.com/acatalog/AL-03-001_extended_info.html)

The pins didn't QUITE line up, but with a little squeeze they fit fine.

Colin says the 1/4 shaft pots DO fit on the boards. Would you guys prefer 1/8" or 1/4" shafts? Does it make a difference to anyone? We're gonna have to get some pretty small knobs to be able to grip them anyway. The pots are right up next to each other.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 06, 2012, 08:26:37 PM
no idea on knobs.  It would be nice to use something like on dbx 160's or SSL's.  Something that can have 2 different colored caps.  1 color for the HP and 1 for the LP.  Anyone have a good source?
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 06, 2012, 11:50:30 PM
We could always do these with inserts: http://classicapi.com/catalog/product_info.php?cPath=23_40&products_id=60 (http://classicapi.com/catalog/product_info.php?cPath=23_40&products_id=60)
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 07, 2012, 12:01:24 AM
Those would work fine.  Right size and we could get a few colored inserts.  Sounds great. 
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on January 08, 2012, 01:38:59 PM
Hey Dan,  you can definitely put me down for one of these cases, along with a prr176 case whenever those are finished up!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 08, 2012, 07:56:50 PM
I'm an idiot, those pots have 4mm shafts, not 1/8". I don't think those knobs are going to fit. Maybe it does make more sense to move to the larger shaft size....

Working on it.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 09, 2012, 01:17:19 PM
What's the current draw of the boards?
Title: Re: Harrison Ford Filter Feeler
Post by: jensenmann on January 09, 2012, 02:28:57 PM
20mA
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 09, 2012, 03:26:16 PM
Beat me to it Jens

Okay, I think it's a wise move to switch to 20mm pots with 6mm shafts. That way we can use standard 1/4" knobs. The 4mm knobs seem to be damn near impossible to source in the US.

Dan: That will mean the pots are going to have to move slightly on the faceplate. Let me know what info you need and I'll track it down.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 09, 2012, 04:05:30 PM
20mA
Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: elskardio on January 10, 2012, 10:12:34 AM
What about an axis converter like this: http://www.banzaimusic.com/Axis-Converter-6-3mm-4mm.html



Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 10, 2012, 11:35:08 AM
Dan: That will mean the pots are going to have to move slightly on the faceplate. Let me know what info you need and I'll track it down.

This is a problem as I have already started the front panels.  Hit me up via email and we can figure it out.
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 10, 2012, 03:04:08 PM
What about an axis converter like this: http://www.banzaimusic.com/Axis-Converter-6-3mm-4mm.html

That's awesome.

I also found some Sifam knobs that should work. Putting it together now...

Anybody using these things yet?
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on January 10, 2012, 06:05:09 PM
What about an axis converter like this: http://www.banzaimusic.com/Axis-Converter-6-3mm-4mm.html

That's awesome.

I also found some Sifam knobs that should work. Putting it together now...

Anybody using these things yet?

I'm raring to go! What are the other Europeans using for power supply? I can solder some components and wires together and throw them in a case but it's working out what the ingredients are!
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 10, 2012, 07:53:36 PM
Any +/- 15V supply that will put out 20mA per channel. So they really don't need much juice. I'm partial to the psu from amb.org but it's slight overkill for this project I think. I may have one built up already so maybe I'll go with that. Or maybe I'll just use this wall wart that was on my workbench until I got a real desk power supply...

Someone suggested the Peter C Green PCU, but I haven't seen boards around for it. It would be nice to find something that fits easily in 1RU.

Title: Re: Harrison Ford Filter Feeler
Post by: Peterson Goodwyn on January 11, 2012, 09:38:09 PM
Quote
It would be nice to find something that fits easily in 1RU.

Alarm bells! I went on the same quest last year and wish I hadn't been so successful. It's cost me double to go back and make the PSU external because the noise on the channels near the transformer was so bad. I know that many here and commercial manufacturers fit PSUs in the same case as the audio all the time, but proceed with caution.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 18, 2012, 01:07:16 PM
DRV134PA , is that:

IC Op amp,
as http://no.farnell.com/texas-instruments/drv134pag4/ic-op-amp-differential-audio-134/dp/1206893 ?

And, TL074P
I didn't find it at Farnell/ Mouser/ Digikey. Where can I get it?
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 18, 2012, 01:19:26 PM
DRV134PA , is that:

IC Op amp,
as http://no.farnell.com/texas-instruments/drv134pag4/ic-op-amp-differential-audio-134/dp/1206893 ?

And, TL074P
I didn't find it at Farnell/ Mouser/ Digikey. Where can I get it?

Looks fine. Any TL074 with the right pinout should work.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 18, 2012, 02:09:44 PM
Looks fine. Any TL074 with the right pinout should work.
Thanks!
Found a couple of suppliers for TL074 :)
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 20, 2012, 03:11:12 AM
What's the lead-spacing for the caps?

https://docs.google.com/spreadsheet/ccc?key=0AmEgFUTJT9ZtdENwNHQ4QmlEU2YybTJ6dmhqNi1TYXc

Are the pots and switch for pcb-mount?

(Still looking for 2-4 boards)
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 20, 2012, 11:51:13 AM
What's the lead-spacing for the caps?

https://docs.google.com/spreadsheet/ccc?key=0AmEgFUTJT9ZtdENwNHQ4QmlEU2YybTJ6dmhqNi1TYXc

Are the pots and switch for pcb-mount?

(Still looking for 2-4 boards)

Yes, the pots and switch are PCB mount. Colin is putting together a kit over at AML. However everything's pretty damn tightly spaced, so if you wanted more room you could mount them off board pretty easily.

Cap spacing is 5mm. I use WIMAs.

Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 20, 2012, 12:06:41 PM
Yes, the pots and switch are PCB mount. Colin is putting together a kit over at AML. However everything's pretty damn tightly spaced, so if you wanted more room you could mount them off board pretty easily.

Cap spacing is 5mm. I use WIMAs.
Thanks! Nice :)
Will Colin sell boards as well?

The Harrison Ford Filter must be an excellent add-on to many DIY-projects, especially preamps and eqs..
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 20, 2012, 12:30:22 PM
I'm gonna have the boards soon.  I'm working on ordering them now!
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 20, 2012, 01:08:38 PM
I'm gonna have the boards soon.  I'm working on ordering them now!
Good news  ;D
Title: Re: Harrison Ford Filter Feeler
Post by: Slenderchap on January 23, 2012, 04:04:34 AM
A few people have asked about kits so we will probably do them (at least for a short time anyway) .... would contain everything except the PCB.... like this;

www.audiomaintenance.com/downloads/harrison_filter_pcb_1.jpg
www.audiomaintenance.com/downloads/harrison_filter_pcb_2.jpg

I just need to get some costings.

Colin
www.audiomaintenance.com
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 23, 2012, 05:02:37 AM
Looking very good Colin!

BTW: What's that 22-23-2041 4way molex for?
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 23, 2012, 10:13:56 AM
Looking very good Colin!

BTW: What's that 22-23-2041 4way molex for?

It's a way to bypass the in and output ICs if you're using it inside another circuit rather than standalone.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 23, 2012, 11:29:50 AM
It's a way to bypass the in and output ICs if you're using it inside another circuit rather than standalone.
Thanks! I was hoping that was the case.

Would it be straight forward to
- go directly from a ssl9k to the the Harrison Ford Filter, skipping the ssl9k balancing board?
and
- Insert it at the link-insert point for the Clarec Eq1549?
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 25, 2012, 10:35:42 AM
What are the specs for the front panel layout, 1 channel?
(Spacing)
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on January 25, 2012, 04:52:21 PM
What are the specs for the front panel layout, 1 channel?
(Spacing)

Depends on the exact pots and switch you use. You'd be better off measuring it yourself than trusting mine...
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 26, 2012, 02:58:59 AM
Depends on the exact pots and switch you use. You'd be better off measuring it yourself than trusting mine...
Ok, thanks! I'll wait for that AML-kit then.
Title: Re: Harrison Ford Filter Feeler
Post by: benlindell on January 31, 2012, 02:26:27 AM
What about an axis converter like this: http://www.banzaimusic.com/Axis-Converter-6-3mm-4mm.html

Does anyone know a place in the US that sells something like this?
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 31, 2012, 12:00:04 PM
Cases are getting closer.  They went to paint today.  He is usually a fast turn around then to my silk screener. Hopefully he will be a quick turn around as well.  Finger crossed!  I have all my parts here as well so I am waiting on them also.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on February 12, 2012, 02:40:14 PM
Hey guys, I just mounted my filters in my case.  Just a few tips that might save you a little time.

1.  No need for Standoffs.  Just use the pots to hold the boards.  They are plenty strong for that and it will save you a ton of work not having to drill the bottom panel for standoffs.

2.  You should use the washers that Collin sends with the pots.  Put them between the Pots and the Front panel.  I tried it without them at first and the bypass switches didn't always have enough room to travel the full distance in order to latch and unlatch.  With the washers they work great. 

3.  Assembly order: I soldered the bypass switches fully into the PCB's.  Then I solder one pin on each Pot to hold the pots in place.  After that I mounted all the PCB's to the front panel.  I did this to ensure a nice fit.  Once I had all the PCB's mounted to the front panel I soldered the rest of the pins on the Pots.  Worked like a charm. 

I am pretty sure if you have already solder switches and pots in you will have no problem with them fitting.  There seems to be enough wiggle room all around.

Ok, cases are in the mail if you have ordered them.  Now I need to sort out my PSU and get the DB25 wired up!


Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on February 12, 2012, 05:04:10 PM
I would love to see some pictures!

btw, Marc, I receive the pcbs some weeks ago.

best regards
Rafael
Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on February 14, 2012, 01:56:19 PM
Dan, are you still planning on doing a run of boards? Sorry if I missed something.

Ben
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on February 14, 2012, 02:16:40 PM
Yep, they are getting made now!
Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on February 14, 2012, 03:05:42 PM
Very glad to hear it, I'll take 8 + case whenever you are ready. Cheers Dan.

Ben
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on February 14, 2012, 03:16:39 PM
I'll take 2-4 pcbs, depending on price.
Awaiting Colins kit as well (Please write the pot-sizes and front-panel layout when you have the kit ready :) )
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on February 15, 2012, 10:09:03 AM
Quote
Yep, they are getting made now!
Hey Dan -
Put me down for a case and eight boards if you have them available -
Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on February 15, 2012, 01:34:21 PM
Ok, I will mark ya down.
Title: Re: Harrison Ford Filter Feeler
Post by: JayDubrek on February 20, 2012, 08:04:08 PM
About to start my 8 boards...and wondered if anyone has finished theirs yet?
Cheers
Jay
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on February 24, 2012, 07:14:17 PM
I accidentally under-ordered pots. As soon as the rest of them and my power supply pcbs show up I'm ready to throw these suckers together. I'll get some pics up as soon as I do!

-marc alan
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on February 24, 2012, 07:22:57 PM
I almost have mine wired up.  Just need to figure out what I will do for the PSU and knobs.  Really close! 
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on March 03, 2012, 01:22:44 PM
About to start my 8 boards...and wondered if anyone has finished theirs yet?
Cheers
Jay

No, I was kind of waiting for the AML kit but then I spoke to Colin and he said it might be a while so I should probably just order the parts myself. What power supply are you intending to use? I'm thinking about a Traco switchmode for simplicity...
Title: Re: Harrison Ford Filter Feeler
Post by: JayDubrek on March 04, 2012, 10:07:04 AM
Hi Al... Just need the pots for this now. These are going into a console I'm building so they'll be sharing power from a JML power station...
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on March 05, 2012, 05:39:05 AM
Hi Al... Just need the pots for this now. These are going into a console I'm building so they'll be sharing power from a JML power station...

Console build... details!
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on March 05, 2012, 02:03:56 PM
Hey guys I got boards back today.  Hit me up with an email if you need boards and or cases for these.

Title: Re: Harrison Ford Filter Feeler
Post by: JayDubrek on March 05, 2012, 04:29:02 PM
Hi Al... Just need the pots for this now. These are going into a console I'm building so they'll be sharing power from a JML power station...

Console build... details!

...I'm going to publish details on here when it's done and it's a while off completion yet! There's a few pics and design details on my Dubrek Facebook page. Nothing too fancy like!
Jay
Title: Re: Harrison Ford Filter Feeler
Post by: TapeOpAl on March 06, 2012, 11:30:37 AM
Hi Al... Just need the pots for this now. These are going into a console I'm building so they'll be sharing power from a JML power station...

Console build... details!

...I'm going to publish details on here when it's done and it's a while off completion yet! There's a few pics and design details on my Dubrek Facebook page. Nothing too fancy like!
Jay

Had a snoop on the FB page, making big moves! Look forward to seeing/hearing more.
Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on March 07, 2012, 11:45:06 AM
Emailed.

Cheers
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on March 12, 2012, 11:54:02 AM
I got mine up and running over the weekend!  They sound great and it was a super easy build.  Now I just need to get some cool knobs for it.  Anyone find any cool knobs?

Title: Re: Harrison Ford Filter Feeler
Post by: jensenmann on March 19, 2012, 05:16:19 PM
I put my first board together and realized a heavy basscut with the HPF-pot in CCW position. Are we sure that the HP filtercaps are right? Anybody else expierienced that?
Changing C1 and C2 to 1uF helps a lot, but there´s still an unnatural LF-boost going on with the filter engaged and HPF pot CCW.
Title: Re: Harrison Ford Filter Feeler
Post by: jensenmann on March 19, 2012, 05:20:13 PM
AARRGGGHHH, stupid me, wrong pots installed. I´d better shut up now and learn to read :o
Title: Re: Harrison Ford Filter Feeler
Post by: Sleeper on March 23, 2012, 03:32:05 PM
Sorry if this is in the wrong place. Is there a build thread?

Anyhow
I just got boards from Dan. Thanks that was quick!
but
I'm out of tl074s 
and
Prior to getting these boards I lashed this filter together with ne5534's and they sound great although the range is a little bit awkward I'm using the 50k C taper pots, perhaps I wired those backwards and pinched the range or I need to change a few resistor values.  I'll do some comparisons now that I have these new boards.
So
has anyone tried these with different opamps like LME49740 for example.
edit:
rats 49740 is not a jfet input... getting pretty hard to find a quad opamp in a dip.
maybe I'll have to order soic to dip adapters for the mc33079's I have
end edit:
I'm thinking I might order these instead of the 074's (or maybe both and try it out)

Thanks
Sleeper



Title: Re: Harrison Ford Filter Feeler
Post by: jensenmann on March 23, 2012, 05:46:57 PM
The not so low bias current of NE5534 will make your pots scratchy after some time. If you don´t want to go the TL074 route then try TLE2074, they should sound cleaner and have higher output current. Make sure that they don´t oscillate!
Title: Re: Harrison Ford Filter Feeler
Post by: Sleeper on March 24, 2012, 12:20:04 AM
Thanks Jensenmann- good point, I've already heard a bit of voltage on the pots now and again.
I'd been looking at this- sslG hi pass
(http://twin-x.com/groupdiy/albums/userpics/normal_ssl.png)
Clever how they nested the pots.
Not clever how they need to use triple pots >:(

I'd like to put some of these into the pre's I use for drums and they have a +-20volt supply thus my aversion to the 074s.  I'll be skipping the INA and the DRV parts.
Hmmmm
That tle might be the ticket. 
It wouldn't kill me to turn the voltage down to 19volts
Thanks Again
Sleeper
Title: Re: Harrison Ford Filter Feeler
Post by: Sleeper on April 01, 2012, 03:51:14 PM
I had a better idea I thought I would share...
I made a small adapter pcb that converts 2 dip8 opamps into 1 dip 14.
Now I'm going to use the opa2604's I have on hand.  I've got a fet input and I don't need to change any voltages
It has to be raised a bit to clear the .1uf caps or I might mount the caps on the bottom of the board. Either way, I'm set. :)
Title: Re: Harrison Ford Filter Feeler
Post by: jensenmann on April 03, 2012, 01:10:43 PM
After some more fiddling with the right pots installed I didn´t like the pot law. There´s too much going on in a too small angle. I swapped the pots to the solderside of the PCB and voila, much better. Unfortunately Dan´s panels don´t work that way. Aaaarrrrgggghhhh again.
What I still don´t like is the upper corner frequency of the LPF when the filter is supposed to be out of the way. It sounds a bit harsh to my ears. So I changed C5 to 22nF and C4 to 6,8nF. Same thing with the HPF, changed C1 and C2 to 220nF (C1 does not have any effect on that, though). Now there´s more control at the lowest end, too. Another improvement was replacing the TL074 with a LT1058 which worked stable in the stock circuit, no matter what signal I threw on it. And finally I changed the LP filtercaps from MKS to FKP and polystyrene, just for esoteric reasons  ;D
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on April 08, 2012, 12:52:24 PM
Is x1 to be shorted/jumpered in pairs if not in use?
(x1 is the unbalance in/out)
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on April 11, 2012, 10:21:09 AM
It's really a tight fit in a 1U case, right? Anybody got smaller pots than 16mm?
It seems like it's not 1 mm left..
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on April 11, 2012, 10:23:47 AM
My BOM with sourcing here:
https://docs.google.com/spreadsheet/ccc?key=0AmEgFUTJT9ZtdENwNHQ4QmlEU2YybTJ6dmhqNi1TYXc
AML, Farnel, Elfa
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on April 14, 2012, 08:12:45 PM
A little tight but not too bad :)

Thanks for the BOM!

Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on April 15, 2012, 02:57:27 AM
A little tight but not too bad :)
Thanks for the BOM!
You're welcome :)

Had to file down the edges of my case (Par-metal) to make it fit.
(Not to mention a bad made nut in one of the handels -needed to make a screw shorter, without a proper clamp ..that's not the easiest thing I've done  :o  )
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on April 17, 2012, 08:43:16 AM
Anyone know the min/max lowcut and min/max highcut when using 47k pots?
(or should I be able to calculate it myself?)
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on April 24, 2012, 03:06:35 AM
The 4mm knobs seem to be damn near impossible to source in the US.
I'm having a hard time sourcing 4mm shaft pots as well.
Tried these: http://no.farnell.com/jsp/search/productdetail.jsp?SKU=1282397
But they don't fit (and don't look like that picture).

Maybe that axis convertor is the way to go? .. expensive to have all these shipments.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on April 24, 2012, 09:22:59 AM
That's why I went with the AML for the pots and switches and mouser for everything else.  It all works and everything fits nicely.  The only thing I'm waiting on are knobs. They are on a long back order from selco.  In the meantime plenty of other things to do.

 
Title: Re: Harrison Ford Filter Feeler
Post by: grubbyliver on April 25, 2012, 11:14:13 AM
Canford UK have these 4mm Sifam knobs:

http://www.canford.co.uk/Products/21549/58-901_SIFAM-S111-004-COLLET-KNOB-115mm-diameter-4mm-shaft-black

You can get different coloured caps for these too although Canford only have black. And Canford postage ain't cheap.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on April 25, 2012, 12:40:04 PM
Canford UK have these 4mm Sifam knobs:

http://www.canford.co.uk/Products/21549/58-901_SIFAM-S111-004-COLLET-KNOB-115mm-diameter-4mm-shaft-black

You can get different coloured caps for these too although Canford only have black. And Canford postage ain't cheap.
Thanks! Sure looking nice :)
A couple of others:
http://www.canford.co.uk/Products/58-801_REAN-C104-COLLET-KNOB-103mm-diameter-4mm-shaft-black
http://www.canford.co.uk/Products/58-911_SIFAM-S151-004-COLLET-KNOB-155mm-diameter-4mm-shaft-black
Title: Filter test
Post by: G-Sun on May 20, 2012, 05:02:26 AM
I've now finished 2 channels. Working fine :)

I've tested the frequency-response, as follows:

- MDA testtone-generator, pink noise
- Reainsert out ADA8000, ch 1 + 2
- Harrison ford filter, ch1 for adjusting lowcut, ch2 for highcut
- Reainsert in Rme Hdsp 9632, ch 1 + 2
- Waves Paz, frequency analyser

I've used the 47k dual rev log pots from AML.

Hard bypassed:
(http://g-sun.no/Upload/img/HFF/HFF%20Hard%20bypassed.png)

Bypassed:
(http://g-sun.no/Upload/img/HFF/HFF%20bypassed.png)

Engaged, all min settings:
(http://g-sun.no/Upload/img/HFF/HFF%20engaged%20low-high.png)

LowCut 9 O'clock, HighCut 15 O'clock
(http://g-sun.no/Upload/img/HFF/HFF%20LoC9-HiC15.png)

LowCut 12 O'clock, HighCut 12 O'clock
(http://g-sun.no/Upload/img/HFF/HFF%20LoC12-HiC12.png)

Both full:
(http://g-sun.no/Upload/img/HFF/HFF%20Full.png)

Mda testtone:
(http://g-sun.no/Upload/img/HFF/Mda%20testtone.png)

Comments:
I don't know why ch 2 is returning 2,7db lower than ch1. Could be some flaw in my ADA8000.
Looks like the locut goes from 65-4k Hz, and the highcut goes from 14k-125Hz.
I'd prefer it to be something like 20-600Hz and 22k-1k hz.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on June 15, 2012, 05:46:55 AM
Now, the question is:
Should I
1) Hard bypass the hicut, or
2) Should I mod R3, R4, R5 and R8 to compensate for the lack of 50k pots, using 3,4k-4k resistors? Will that take me in the right direction regarding cutoff-frequency?
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on June 21, 2012, 09:27:31 PM
Now, the question is:
Should I
1) Hard bypass the hicut, or
2) Should I mod R3, R4, R5 and R8 to compensate for the lack of 50k pots, using 3,4k-4k resistors? Will that take me in the right direction regarding cutoff-frequency?

Tough call.

Personally, I'd imagine that the throw of the filters is part of what causes people to talk about how good they sound. It's a very simple, practically low-fi design. As you awesomely demonstrated, when you take the unit out of bypass even with the filters all the way open you get a nice little presence and bottom boost. Good old loudness curves, subjectively better sounding.

Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on June 22, 2012, 05:18:43 AM
As you awesomely demonstrated, when you take the unit out of bypass even with the filters all the way open you get a nice little presence and bottom boost. Good old loudness curves, subjectively better sounding.
You're right. I didn't notice the boost myself, but looking again it's there, both for hi and low.
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on June 22, 2012, 01:56:17 PM
I'm not trying to talk you out of modding the points :) Just saying that I've tried to look at it as a cool facet of the design rather than an imminent flaw. You should certainly be able to make them into cleaner sounding units if that's what you want them for. My first vote would definitely be going with an earlier thought in this thread and swapping out that TL074. That thing's kinda nasty.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on June 22, 2012, 02:31:53 PM
Is there a list of IC's that are good options for replacements?  I have a feeling a slightly newer op amp might have even more clarity and punch.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on June 22, 2012, 02:47:42 PM
I'm not trying to talk you out of modding the points :) Just saying that I've tried to look at it as a cool facet of the design rather than an imminent flaw. You should certainly be able to make them into cleaner sounding units if that's what you want them for.
Well, Id really prefer to have one bypass for each filter, or a possibility to get them out of the way.
So, that's what I'm hoping for with the modding -adjust the cutoff max/min to be able to use one without the other.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on July 06, 2012, 11:27:47 AM
I just wanted to post about some knobs.  Marc found them and I ordered some to test and they work great.

They are from Selco and take a while to get but the fit is right for my panels and AML pots!  They also look very nice.

P/N: S111-004BLACK - Knobs
P/N: C110BLUE - End Cap
P/N: RED - End Cap


Hope that helps anyone who is looking.  Thanks Marc for the good find!

Title: Re: Harrison Ford Filter Feeler
Post by: Sleeper on August 23, 2012, 01:14:12 AM
Is there a list of IC's that are good options for replacements?  I have a feeling a slightly newer op amp might have even more clarity and punch.

I had some THAT 1240 and THAT 1646 chips that I used on the front end, they drop in in place of  the INA and DRV chips.  I like those better for starters. 
I have one set that uses  OPA2604's on a little daugtherboard, because I had a 22 volt supply in that box.  they sound dandy.
I'm also liking TLE2072 (or maybe its 2074... they make duals and quads)  these sound great. also a pretty much straight drop in replacement for other chips.  these are great, they cost a couple of bucks.  worth it.

Hey I've got the strange weather boards.  They bench tested great, but somehow when I put them in to a case and wired em up they were still working.  Not when I started patching in from real gear though... I just opened this up and it looks like the input and output pins are if not mislabeled at least labelled in a strange way. grrrrrr  confusion.
gotta recheck my data sheets.   
resoldering now.
Title: Re: Harrison Ford Filter Feeler
Post by: Volume11 on August 29, 2012, 02:06:45 AM
Will these boards be available again in the near future, please?  :)
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on August 29, 2012, 09:56:25 AM
They are now.  I have them and the cases in stock!
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on September 10, 2012, 05:30:24 AM
Hey, do you guys think this supply from diypartssupply would be a good option for this project?
http://diypartssupply.com/index.php?main_page=product_info&cPath=2&products_id=34
Wonder if the big caps would fit in the 1u case...
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on September 10, 2012, 07:58:41 AM
Hey, do you guys think this supply from diypartssupply would be a good option for this project?
http://diypartssupply.com/index.php?main_page=product_info&cPath=2&products_id=34
Wonder if the big caps would fit in the 1u case...
Guess so.
How many units are you planning to have in one rack? Just the filters?
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on September 11, 2012, 04:31:34 AM
Guess so.
How many units are you planning to have in one rack? Just the filters?
Yeah, just doing 8 filters in Dan's case.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on September 11, 2012, 05:40:40 AM
Guess so.
How many units are you planning to have in one rack? Just the filters?
Yeah, just doing 8 filters in Dan's case.
http://wiki.nimbleswitch.com/Currrent_Draw

Ok, so that's 8 x 20 mA = 160mA
Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on December 04, 2012, 12:36:17 PM
So, noob question - single rail, or dual rail PSU? 

I am assuming single, since 15volts is the only rating specified in this thread...
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on December 04, 2012, 03:27:20 PM
So, noob question - single rail, or dual rail PSU? 

I am assuming single, since 15volts is the only rating specified in this thread...
Dual
Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on December 05, 2012, 08:25:55 AM
Thanks G-Sun.  Do you know of a concise, noob-oriented explanation of n-rail power supplies as they apply to our DIY audio world?
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on December 05, 2012, 11:04:24 AM
Hey Guys I am gonna do another run of these cases.  So I should have more in stock in a few weeks.

Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on December 05, 2012, 12:14:44 PM
Thanks G-Sun.  Do you know of a concise, noob-oriented explanation of n-rail power supplies as they apply to our DIY audio world?
I use JLM AC/DC kit a lot (3 rails)
http://www.jlmaudio.com/shop/index.php?_a=viewCat&catId=6
But I've seen some good other suppliers as well.
Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on December 05, 2012, 12:33:01 PM
Thanks again - I will check out JLM.

Another question - this time regarding applicable dual-gang potentiometers.   The pots on the AML site would be prohibitively expensive, due to overseas shipping.

Would the following part, available at Mouser be an acceptable substitute?

http://www.mouser.com/ProductDetail/Alpha-Taiwan/RV122F-20-15F-A50K/?qs=sGAEpiMZZMtC25l1F4XBU1Dxzr6mc3JGVMfH0qeg68U%3d

Also - the BOM calls for 50k linear - but the recommended AML pot is marked as reverse log - are these interchangeable?

Finally, I just put in my order for the case+pcbs, so maybe I'll have some build pics soon... I still have to finish my GSSL though (kicking myself for not seeing the SB4000 first).
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on December 05, 2012, 02:58:46 PM
I believe "Taper: Audio" is rev.log (but I'm not the expert)
Else AML is 47k rev.log aren't they (at least mine are), so I'd go for 50k. Looking good to me.

Somebody else could chime in on the practical difference linear vs. rev.log
Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on December 06, 2012, 10:39:02 AM
Well,  I took the plunge into the pond, and ordered my potentiometers and pushbuttons from AML :)   I'd rather pay a bit extra and ensure compatibility - as patience and component removal are not my strong suites.

I have an Avel 30vac 18+18 toroidal xformer coming from eBay, and will be ordering the JLM Powerstation kit.

PCBs and case coming from Dan, too.

So, it this all works out - I will have 2 channels of GSSL, and 2 channels of Harrison EQ.   Too bad it's going to be fed by a JoeMeek TwinQ (although I shouldn't slag the preamps - they're not horrid or anything).

Has anyone mounted a toroid and PS inside Dan's cases?
Title: Re: Harrison Ford Filter Feeler
Post by: signalflow on December 06, 2012, 10:58:36 AM
I believe "Taper: Audio" is rev.log (but I'm not the expert)
Else AML is 47k rev.log aren't they (at least mine are), so I'd go for 50k. Looking good to me.

Somebody else could chime in on the practical difference linear vs. rev.log

Audio Taper refers to a standard Log Potentiometer. 
What you are after is a Rev Log or a Rev Audio Taper pot for this.

And before you ask, wiring the pot backwards will not produce the results you're after.

Generally speaking designations for pot taper are:
A=Log
B=Linear
C=Rev. Log

So a 10KA would be a 10K Log and so on.

AML is the only store I've found that has anything remotely close without having to put together a group buy for 50KC Dual Pots.  Except for the SSL online store, but they are more expensive than AML plus they wont fit the boards.

-Casey
Title: Re: Harrison Ford Filter Feeler - PSU
Post by: dandeurloo on December 06, 2012, 11:14:39 AM
A number of guys have asked about PSU's for this project.  I ended up using one I purchased from ebay.  I had to put shorter filter caps in and cut down the heat sinks but it has worked great and was really pretty cheap.  I got it from this seller.  I have actually used these in a number of projects.  So it may be worth it to grab a few for future projects.


http://myworld.ebay.com/electronics-salon?_trksid=p2047675.l2559

Here is a link for the PSU I used.
http://www.ebay.com/itm/Power-Supply-Board-Kit-PCB-Based-on-LM317-LM337-IC-/260484989112?pt=US_Amplifier_Parts_Components&hash=item3ca61d80b8

I then used a transformer from Antek.
http://www.antekinc.com/gview.php?d[]=0

I hope that helps.
Title: Re: Harrison Ford Filter Feeler
Post by: Harpo on December 06, 2012, 05:53:52 PM
Generally speaking designations for pot taper are:
A=Log
B=Linear
C=Rev. Log
So a 10KA would be a 10K Log and so on.
...for pots from US based manufacturer.
European taper marking might as well be A=linear; C=log; F=rev.log
Asian taper marking might as well be A=log; B=linear
Vishay also used taper marking A=linear; L=log; F=rev.log
Better read the datasheet or measure the pot at mid travel if an 'A' taper pot marking is an indicator for a lin or log taper.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on December 07, 2012, 03:26:08 AM
Generally speaking designations for pot taper are:
A=Log
B=Linear
C=Rev. Log
So a 10KA would be a 10K Log and so on.
...for pots from US based manufacturer.
European taper marking might as well be A=linear; C=log; F=rev.log
Asian taper marking might as well be A=log; B=linear
Vishay also used taper marking A=linear; L=log; F=rev.log
Better read the datasheet or measure the pot at mid travel if an 'A' taper pot marking is an indicator for a lin or log taper.
LOL
I'll just copy that into my notebook. Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on December 11, 2012, 05:46:08 AM
Quick photo of work in progress.  Everything seems to fit nicely.  Now on to the psu, wiring, etc...

(http://farm9.staticflickr.com/8479/8264122744_b59b3144cf.jpg)
Title: Re: Harrison Ford Filter Feeler - PSU
Post by: straypacket on December 21, 2012, 03:50:52 PM
A number of guys have asked about PSU's for this project.  I ended up using one I purchased from ebay.  I had to put shorter filter caps in and cut down the heat sinks but it has worked great and was really pretty cheap.  I got it from this seller.  I have actually used these in a number of projects.  So it may be worth it to grab a few for future projects.
...

Thanks Dan!  I wish I knew about Antek before.   I've ordered a transformer and power supply kit from the sources you referenced.

Out of curiosity, how do you wire from the PSU to the eight PCBs - series, parallel, other?  Does it matter?
Title: Re: Harrison Ford Filter Feeler - PSU
Post by: butlerscheme on January 13, 2013, 09:03:17 PM
That's something i'd also like to know.  Do you wire the PSU to board 1 of 8 and then daisy chain them on??
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 13, 2013, 10:58:00 PM
Yes, daisy chain them. That is how I did it anyway. 
Title: Re: Harrison Ford Filter Feeler - PSU
Post by: G-Sun on January 14, 2013, 02:47:59 AM
That's something i'd also like to know.  Do you wire the PSU to board 1 of 8 and then daisy chain them on??
This is something I don't understand.
Wouldn't that mean putting the circuits in series, thus giving each board 1/8 of required voltage?
Title: Re: Harrison Ford Filter Feeler - PSU
Post by: tmuikku on January 14, 2013, 02:50:52 AM
That's something i'd also like to know.  Do you wire the PSU to board 1 of 8 and then daisy chain them on??
This is something I don't understand.
Wouldn't that mean putting the circuits in series, thus giving each board 1/8 of required voltage?

Daisy chaining makes them parallel, all get same voltage. Just the way you've got your TV, VCR and DVD player on an extensioncord ;)
Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on February 08, 2013, 09:48:56 PM

My case from Dan arrived yesterday!!  Knobs are on their way, from another forum member.

2 boards completed.  Only 6 more to go, then the daunting task of wiring the db25 connectors...  I'm tempted to just see if I can squeeze 16 TRS jacks in the space between the star ground hole, and the first db25 :)

What did others do for sourcing their knobs?
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on February 18, 2013, 10:16:42 AM
What is the part # for the power switch for Dan's case? Anyone know offhand?
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on February 18, 2013, 11:04:00 AM
I'm 90% sure its Mouser Part #: 611-D102J12S217DQA.
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on February 22, 2013, 10:25:54 AM
Anyone thought about adding a mix out - i.e. summing the 8 channels to a single XLR out? Might need some gain makeup I suppose.
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on February 23, 2013, 06:17:47 PM
What are the dimensions of these boards?  I don't see that info anywhere.  Thanks.
Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on February 24, 2013, 04:44:58 AM

Hi emrr -

I dug out my spare boards and gave one a measure -  they are approx. 91mm x 41mm.


Hi Group -
So, no one has sourced knobs for these yet ?????
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on February 24, 2013, 02:00:39 PM
Hi Group -
So, no one has sourced knobs for these yet ?????

Straypacket post #206 has part # for knobs form Silco.  You have to order them direct but they work great.  I ordered knobs from them as well for my Sontec.
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on February 25, 2013, 11:00:16 PM
Are these boards turning out 25-2K75Hz HPF and 160-20kHz LPF like the current Harrison/Great River product?  I really can't make out the legend on the case in any pictures, and don't find that info anywhere in the thread, only G-Sun's comment that his appear to show:

Quote
65-4k Hz, and the highcut goes from 14k-125Hz.

Here's an alt 20Hz-200Hz version of the HPF, possibly of interest to some off-roaders.  This appears the most common circuit found in a google search.  Looks like this variation with lower filter gain lacks the ripple boost above the cut-off frequency. 

(http://s.eeweb.com/members/circuit_projects/blog/2012/01/12/20Hz-to-200Hz-variable-high-pass-filter-1326382791.gif)

Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on March 01, 2013, 11:41:13 PM
I've got two channels wired up, powered, and ready to go. 

I'm seeing that the input pads are marked


 +       -
 o   o   o


So, (naturally?) I assume that the unmarked middle pad is ground ... but,  while testing the wiring on the inputs I'm noticing that the input pad marked negative (rightmost input pad, when looking from the top of the board) is tied to ground - and the middle input pad seems to be where the negative input is tied to the ICs.

Am I missing some basic Ohm's-Law-ish principle, or is the board mis-labeled?

I searched within the thread for "input ground" and "negative ground" but didn't turn up any info.
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on March 03, 2013, 09:55:19 AM
The input pads are mislabeled. 
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on March 03, 2013, 04:07:05 PM
Are these boards turning out 25-2K75Hz HPF and 160-20kHz LPF like the current Harrison/Great River product?  I really can't make out the legend on the case in any pictures, and don't find that info anywhere in the thread, only G-Sun's comment that his appear to show:

Quote
65-4k Hz, and the highcut goes from 14k-125Hz.


Did some cypherin', calculator says 31.6-4K8 and 133-17K ranges.
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on March 04, 2013, 11:20:57 AM
Quote
This appears the most common circuit found in a google search.

These pcbs are exactly the circuit in this Harrison 3232 schematic with input/output ICs. Looking at the HPF/LPF sections of the attached schem confirms this.
Not sure what the Great River is but I don't think this project was ever intending to be a clone of it.
Finding a good picture of a 3232 channel strip would be a good reference for labeling.
 
i.e.
http://www.uaudio.com/blog/bruce-swedien-harrison-32c/
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on March 04, 2013, 12:26:44 PM
Also, follow up to the last post, Dan's front panel uses the same freq labeling as the original..

And by the way, Smart Studios had a Harrison for awhile in the '80s and I heard the these HP LP filters were really special. They were very good to allow for layering of tracks.
I'm looking forward to finishing them. Someday soon I hope.

Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on March 04, 2013, 01:22:26 PM
The optional circuit is what I referred to in what you quoted.  The Great River is done in conjunction with Harrison and appears to be a reissue. 

Did some cypherin', calculator says 31.6-4K8 and 133-17K ranges.

Curious if anyone other than G-Sun has measured their build.  The math says different on the frequency range.  I assume source drive Z changes the math, which I assume is based on 0R source. 
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on March 04, 2013, 01:33:35 PM
The great river eq's are killer!  I have used them many times and love them.

I just thought I would add that to this thread.
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on March 06, 2013, 11:01:14 AM
Anybody have a Mouser part number for the switch caps that work with Dan's front panel?
The ones I ordered are too big. You'd think I'd be able to measure...
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on March 06, 2013, 03:21:57 PM
I posted this in the thread somewhere already. 

P/N: S111-004BLACK - Knobs
P/N: C110BLUE - End Cap
P/N: RED - End Cap

I ordered these parts from Selco.  Selco is the same place I am ordering my knobs and caps for the Sontec EQ I just built. 

Title: Re: Harrison Ford Filter Feeler
Post by: dmp on March 06, 2013, 03:28:46 PM
Thanks - but I meant the push button bypass switch. The caps I got are a little too big for the holes in the front panel

I've ordered from selco several times. They have great service and seem to be able to get any sifam knob you might need.

Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on March 06, 2013, 03:47:00 PM
Oh, I got those from CAPI!

http://classicapi.com/catalog/product_info.php?cPath=22_117_55_91_95_144&products_id=117
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on March 06, 2013, 04:35:02 PM
Cool thanks
Title: Re: Harrison Ford Filter Feeler
Post by: straypacket on March 22, 2013, 06:28:56 PM
Regarding Selco orders:  Dan, are you ordering in large quantities?   They told me there was a $50 minimum...
Title: Re: Harrison Ford Filter Feeler
Post by: jimkeaney on June 04, 2013, 04:44:35 PM
Hi guys, I've had one of these pcb's kicking around for a while. I bought it hoping to make a guitar pedal out of it. Anyone have any ideas on what components/etc I'd have to replace/manipulate to make it a guitar friendly impedance?
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on June 04, 2013, 04:55:40 PM
Regarding Selco orders:  Dan, are you ordering in large quantities?   They told me there was a $50 minimum...

I just did them for this and my Sontec EQ.
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on June 07, 2013, 12:18:28 PM

jimkeaney : you don`t need the the balanced input and output, replace r1 for a cap and r2 for a 1M. that should be enough.
Title: Re: Harrison Ford Filter Feeler
Post by: Esoterimix on June 25, 2013, 11:29:31 AM
Does anyone have 2-4 pcb's (assembled or not) for the Harrison Ford Filters? I'd be interested in getting my hands on a few of them... Feel free to e-mail me if you have extras: [email protected]

Thank you in advance! I gotta say, being new to this community, it's nice to see so many people involved and communicating... All the help has been great thus far. p.l.u.r.
Title: Re: Harrison Ford Filter Feeler
Post by: tonycamp on July 30, 2013, 01:47:50 AM
Hi fella's,

i scanned the whole thread, i'm wondering, roughly, how much is the build for 8 channels, i'm thinking of going for it.

thanx
T
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on September 01, 2013, 12:38:50 AM
Dudes, am I crazy or is this thing +6 in both bypass and on?  It is!  (that would be +7.5 at the Chebychev ripple points)

on:
INA134 (unity) -> R1/R2/IC1A (-6) -> HPF (+6) ->LPF (unity) -> DRV134 (+6) = +6dB

bypass:
INA134 (unity) -> DRV134 (+6) = +6dB

Put INA137 or THAT1246 in the input to have unity throughput. Or am I crazy? 

I can't quite believe it got missed, but I sure don't see it addressed anywhere in the thread, or the related threads. 


Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on September 02, 2013, 05:49:47 PM
Here's a bit of esoterica for all to consider.  When coupled with INA137 or THAT 1246 (-6 dB).

DRV134: unity gain driving 600 ohms.  +0.7 dB driving 10K.
THAT1646: unity gain driving 10K.  -0.7 dB driving 600 ohms. 

In other words, both are +6 dB parts characterized for different loads, even though they are considered interchangeable. 

May make a difference to you, may not.  Important to grasp that a hard bypass of either system is still not likely a matched gain comparison. 
Title: Re: Harrison Ford Filter Feeler
Post by: Harpo on September 02, 2013, 07:51:27 PM
Here's a bit of esoterica for all to consider.  When coupled with INA137 or THAT 1246 (-6 dB).

DRV134: unity gain driving 600 ohms.  +0.7 dB driving 10K.
THAT1646: unity gain driving 10K.  -0.7 dB driving 600 ohms. 

In other words, both are +6 dB parts characterized for different loads, even though they are considered interchangeable. 

May make a difference to you, may not.  Important to grasp that a hard bypass of either system is still not likely a matched gain comparison.
? So they seem interchangeable and both suffer from same 0.7dB level drop with higher load that a hard bypass would leave unchanged.
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on September 02, 2013, 08:36:46 PM
Both are characterized as +6 parts, but one is +6 into 10K ohms, the other +6 into 600 ohms.
Title: Re: Harrison Ford Filter Feeler
Post by: sr1200 on September 11, 2013, 11:12:16 AM
Hey, just want to know if I built my filters correctly, or if i did something terribly wrong.  2 issues.
1) theres a ton of added gain through the units.
2) the bypass switch works kind of opposite the way id expect (pushed in means ON not bypass).

They sound AMAZING, so im not complaining (much) just wanna figure out if i messed something up or not.
Title: Re: Harrison Ford Filter Feeler
Post by: sr1200 on September 11, 2013, 04:13:22 PM
OK so changing out the IC's will give unity?  Or am i totally missing something here?
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on September 11, 2013, 04:32:08 PM
I'd guess you are probably almost 7 dB up, so swapping input IC and loading the DRV output with 600-700 ohms should get you to unity.  If you have a THAT part in the output, it's fine unloaded.   
Title: Re: Harrison Ford Filter Feeler
Post by: sr1200 on September 11, 2013, 04:45:56 PM
sorry im terrible at this, when you say load the output are you just talking harware impedance (like mic pre impediance) or is there a resistor that needs to be changed on board.
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on September 11, 2013, 04:54:49 PM
If you used the DRV output part, a 600-700 resistor added across the output + and - will do it, when feeding 10K+ input devices.   If you used the THAT part it's fine.  There's no place onboard for that resistor.   The input chip is the bigger deal.  Measure your actual gain as-is now to confirm what I'm expecting.

#2) it's designed as button out = bypass.  Intuitively it's an 'on' button rather than a 'bypass'.
Title: Re: Harrison Ford Filter Feeler
Post by: sr1200 on September 11, 2013, 11:59:30 PM
+6.8 so yeah, you're pretty much on the money!
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on September 12, 2013, 07:58:51 AM
Thanks for the confirmation.
Title: Re: Harrison Ford Filter Feeler
Post by: dogma on September 12, 2013, 09:14:56 AM
Hey, I'm going to start a wtb thread but if anyone has any spare pcbs could they please pm me.
Thanks.
Matt.
Title: Re: Harrison Ford Filter Feeler
Post by: dogma on September 14, 2013, 05:40:32 AM
Anyone thought about mounting these on a 500 veroboard? Seems to be a perfect t project
Title: Re: Harrison Ford Filter Feeler
Post by: sr1200 on September 14, 2013, 04:37:24 PM
Yes, i contemplated doing that before I got the 1u case that holds 8 lol.
Title: Re: Harrison Ford Filter Feeler
Post by: tonycamp on October 24, 2013, 02:38:38 AM
Hi Fella's,
can anyone share an approximate cost for the 8 channel project?

thanx
Title: Re: Harrison Ford Filter Feeler
Post by: dmp on October 24, 2013, 11:54:38 AM
Quote
Dudes, am I crazy or is this thing +6 in both bypass and on?  It is!  (that would be +7.5 at the Chebychev ripple points)
on:
INA134 (unity) -> R1/R2/IC1A (-6) -> HPF (+6) ->LPF (unity) -> DRV134 (+6) = +6dB
bypass:
INA134 (unity) -> DRV134 (+6) = +6dB
Put INA137 or THAT1246 in the input to have unity throughput. Or am I crazy?
I can't quite believe it got missed, but I sure don't see it addressed anywhere in the thread, or the related threads. 

Nice work, Doug. 
So a  INA137 or THAT1246 on the input gives unity gain (instead of INA134, which is +6dB).

Those 134 chips are expensive - maybe the BOM on the first page could be updated?
Title: Re: Harrison Ford Filter Feeler
Post by: KrisstheWizz on December 27, 2013, 07:31:05 AM
Quick photo of work in progress.  Everything seems to fit nicely.  Now on to the psu, wiring, etc...

(http://farm9.staticflickr.com/8479/8264122744_b59b3144cf.jpg)

Hi!

That looks great! How did the wiring go?

I've only built a couple of preamps for my luchbox so I'm a bit puzzled about the psu and wiring process. Would be nice to see some finished units.

Peace!
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 27, 2014, 12:24:03 PM
You can see some pics here:
http://groupdiy.com/index.php?topic=48771.0
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 27, 2014, 12:30:05 PM
Looks great!

I wanted to let you guys know I am going to start stocking pots and knobs for these.  That will make it much easier.  Once I get those in I may do full kits. 

The Knobs and Pots are ordered!
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 27, 2014, 03:20:29 PM
Looks great!

I wanted to let you guys know I am going to start stocking pots and knobs for these.  That will make it much easier.  Once I get those in I may do full kits. 

The Knobs and Pots are ordered!
Cool. I had problems finding the right knobs. Using 6,3mm for the 6mm shafts I belive. Not pro, but works :)
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 30, 2014, 05:30:10 AM
I'd like to mod the filters.

From post #199 (http://groupdiy.com/index.php?topic=46390.msg615795#msg615795) I read that
with the 47k pots
Lo-cut is something like 58-4k Hz
Hi-cut is something like 120-14kHz

Now, what I'd like is
Lo: 20hz-1k4Hz (divided by 3)
Hi: 240-2k8hz (multiplied by 2)
or something along those lines.

The highpassfilter is a dual 12db/oktave aktive filter, right?

(http://upload.wikimedia.org/math/7/d/8/7d87bc118166402407c6194a521f4eac.png)

and Highpass#1 is determined
by R3 (390) and pot (0-47k) and cap C2 (0,1u)?
So, fc_min = 1/(2 * pi * 390 * 0 * 0,1 * 10^-6) = 0,08 ??
So, fc_max= 1/(2 * pi * 390 * 47000 * 0,1*10^-6) = 4080

and for lowpass (the same formula)
c5 (0,047u) R4 (390) and pot (0-47k)
fc_max = 1/(2 * pi * 390 * 0,047*10^-6) = 8682 ??
fc_min = 1/(2 * pi * 390 * 47000 * 0,047*10^-6) = 0,18 ??

My calculations seems of, yet the odd thing is hipass fc_max. It seems right..

So, either I need to change some resistors (R3, R4, R5, R8) or
some caps (C2, C3, C4, C5), right?



Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 30, 2014, 08:20:07 AM
Seems like the capacitors are easiest to change.

So, for highpass:
C_new = C_old * 3 = o,1uF * 3 = 0,3uF
(So, 0,33is the value to look for, right?)

and for lowpass:
C_new = C_old / 2 = 0,047uF / 2 = 0,0235uF = 23,5nF
(I guess 0,022uF then maybe)

Edit: I need some help here. It seems like I don't understand the components involved or the curcuit.
Checked C3 and C4 and they are not identical to C2 and C5. hmm.. ??
These are 12db, filters, right? And the dual pots are because the filters are doubled, right (vs. 6db/oct)?

I guess this is the right diagrahm for the highpass-filters:
(http://upload.wikimedia.org/wikipedia/commons/thumb/8/87/Active_Highpass_Filter_RC.png/300px-Active_Highpass_Filter_RC.png)

And this is for the lowpass-filter:
(http://upload.wikimedia.org/wikipedia/commons/thumb/5/59/Active_Lowpass_Filter_RC.svg/300px-Active_Lowpass_Filter_RC.svg.png)
I presume (from wikipedia)
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 30, 2014, 08:51:52 AM
Now, this must be close to correct for the highpassfilter:
(http://www.electronics-tutorials.ws/filter/fil92.gif)
http://www.electronics-tutorials.ws/filter/filter_6.html

The only thing different is C3.

and here is the corresponding for the low-pass:
(http://www.electronics-tutorials.ws/filter/fil90.gif)
http://www.electronics-tutorials.ws/filter/filter_5.html

The difference is R1 and R2 who is omitted.
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on January 30, 2014, 09:34:44 AM
http://groupdiy.com/index.php?topic=44444.msg567566#msg567566

Site may be of use:

http://sim.okawa-denshi.jp/en/Fkeisan.htm
Title: Re: Harrison Ford Filter Feeler
Post by: bruce0 on January 30, 2014, 12:36:32 PM
Quick photo of work in progress.  Everything seems to fit nicely.  Now on to the psu, wiring, etc...

(http://farm9.staticflickr.com/8479/8264122744_b59b3144cf.jpg)

Looks nice.  I noted nice TASCAM punches on back panel.

Ian (ruffrecords) has some DB25 summing PCB's, and if you leave the resistors off they have a jack so they can just be DB25 interface PCB's which might work well for you.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 30, 2014, 01:07:26 PM
I just wired up each channel nicely to the DB25.  Pretty easy to do.
Title: Re: Harrison Ford Filter Feeler
Post by: mdmitch2 on January 30, 2014, 05:36:37 PM
Looks great!

I wanted to let you guys know I am going to start stocking pots and knobs for these.  That will make it much easier.  Once I get those in I may do full kits. 

The Knobs and Pots are ordered!

Very interested in a full kit for this.
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 31, 2014, 04:00:49 AM
http://groupdiy.com/index.php?topic=44444.msg567566#msg567566

Site may be of use:

http://sim.okawa-denshi.jp/en/Fkeisan.htm
Thank you very much Doug!
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 31, 2014, 04:21:19 AM
(http://www.electronics-tutorials.ws/filter/fil92.gif)
http://www.electronics-tutorials.ws/filter/filter_6.html

(http://www.electronics-tutorials.ws/filter/fil90.gif)
http://www.electronics-tutorials.ws/filter/filter_5.html

Highpass:
(from Harrison Ford Schemo, attached)

fc_min = 2pi / sqrt((pot+R6)*(pot+R3)*C1*C2) = 2pi / sqrt((47000+390)*(47000+390)*0.1^2*10^-6) = 1,32
fc_max = 2pi / sqrt((0+390)*(0+390)*0,1^2*10^-6) = 161

Lowpass

fc_min = 2pi / sqrt((R4 +pot)*(pot+R5)*C5*C4) = 2pi / sqrt((47000+390)*(47000+390)*0.047*10^-6*0.012*10^-6) = 5582
fc_max = 2pi / sqrt((0+390)*(0+390)*0.047*10^-6*0.012*10^-6) = 678384

This is still wrong..

http://web2.0calc.com/
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 31, 2014, 04:41:56 AM
Now, trying the link from Doug:
http://sim.okawa-denshi.jp/en/OPseikiHikeisan.htm
http://sim.okawa-denshi.jp/en/OPseikiLowkeisan.htm

I get

Highpass:
fc_min = 33,6Hz
fc_max = 4080Hz

Lowpass:
fc_min = 141Hz
fc_max = 17183Hz

:) :) :)

Now, these figures are "better" than my visual readings. Hm.. what to trust most?
I could live with locut_min 33hz and hicut max 17kHz.

Yet, modding seems better.
Could I just take e.g. C1 and multiply value with 4
and e.g. C5 dividing by 4?
without screwing some other elements of the design (that I don't understand) ?
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 31, 2014, 05:00:25 AM
So, setting

C1 to 0,47uF i get
highpass_min = 15Hz
highpass_max = 1,9k

C5 to 0,012uF
lowpass_min = 280
lowpass_max = 34k
Edit:  WIMA - MKS2 0.015µF
min: 250
max: 30k

Looking good to me.
Title: Re: Harrison Ford Filter Feeler
Post by: Harpo on January 31, 2014, 06:02:50 AM
Highpass:
(from Harrison Ford Schemo, attached)

fc_min = 2pi / sqrt((pot+R6)*(pot+R3)*C1*C2) = 2pi / sqrt((47000+390)*(47000+390)*0.1^2*10^-6) = 1,32
..........
is not what the formula said, for example
fc_min = 1 / ( 2*PI() * SQRT( (47000+390)*(47000+390)*100e-9*100e-9) ) = 33.584
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on January 31, 2014, 06:12:20 AM
Highpass:
(from Harrison Ford Schemo, attached)

fc_min = 2pi / sqrt((pot+R6)*(pot+R3)*C1*C2) = 2pi / sqrt((47000+390)*(47000+390)*0.1^2*10^-6) = 1,32
..........
is not what the formula said, for example
fc_min = 1 / ( 2*PI() * SQRT( (47000+390)*(47000+390)*100e-9*100e-9) ) = 33.584
Ah.. thanks! Now I can have peace of mind :)
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on February 11, 2014, 11:41:59 AM
Pots arrived yesterday.  ;D  Now I am waiting on the Knobs.  They will probably be another few weeks.   
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on March 13, 2014, 02:45:13 PM
Looks like Harrison liked our idea :) Another big thanks to everybody involved in this, particularly 12afael, Jens and Dan! I haven't been around in a while and it looks like people have figured out all my screwups. Maybe it's time to go back and mod some of my original ones (which still work great btw).

(http://harrisonconsoles.com/site/images/832cimg.png)
Title: Re: Harrison Ford Filter Feeler
Post by: dogma on March 15, 2014, 04:09:01 PM
yes i laughed when i saw this. Street is $2350!
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on March 15, 2014, 06:40:48 PM
woah!
Title: Re: Harrison Ford Filter Feeler
Post by: kdramsey on March 30, 2014, 04:11:49 PM
Just finished a pair of prototype units for 500 series.  I added a few extras to suit my needs including the ability to turn each band off separately.  The other feature is a -6dB per octave slope for a more gentle cut. It is interesting that Harrison added a meter to their 832c filter... I was thinking about adding a signal present led and possibly a makeup gain knob.

(http://i1248.photobucket.com/albums/hh492/kdramsey540/image_zps8088f40c.jpg)

(http://i1248.photobucket.com/albums/hh492/kdramsey540/image_zps594cb1e6.jpg)

Title: Re: Harrison Ford Filter Feeler
Post by: mutetourettes on March 31, 2014, 09:19:03 AM
I find myself intrigued by this circuit - I reckon i'll be building it unbalanced too, and I'm going to try and use that fourth Opamp stage (which is, I think, unused, right?) for a little variable all-pass filter... might combine two channels' worth for a two-stage all-pass that can work on one of the channels rather like the ibp... is that nuts? all my filters in one basket....
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on March 31, 2014, 09:31:23 AM
UPDATE:

Kits are almost in stock.  I am just waiting on a few more parts to show up.  They will be for 8 channels to go along with the chassis.  Still working out pricing.  I need those last parts to get here to figure that out. 

Title: Re: Harrison Ford Filter Feeler
Post by: dogma on April 04, 2014, 05:25:27 PM
As there is so much room with the studer 169 I've been thinking of putting them both in a 500'slot and see if they fit. What do you guys think?
Title: Re: Harrison Ford Filter Feeler
Post by: dogma on April 15, 2014, 02:30:49 PM
Hey dan is there any update on the kit availability and therefore the cost would be known too?
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on May 02, 2014, 04:07:44 PM
I finally had time to price stuff out.

Kit (case purchased separate): $475 + shipping
Kits include parts for 8 channels: Knobs, Push botton caps, switches, pots, PCB's, resistors, caps (Wima's for the filters), IC's, IC sockets, IEC inlet, DB25 connectors and Molex headers, crimps pins.  You need the case and front panel seprataley, the PSU and power lamp.

The PSU and power lamp are things that can easily be sourced.  I left them out so I didn't have to worry about what part of the world everyone lives in.  A number of other guys in the White Market have good options for these.


Kit & Case Comb Sell:  $600 + Shipping

I hope this helps. 

Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: manulaudic on May 16, 2014, 05:30:15 AM
Oua great post !

Are the pcbs still available?
I would love to build one into 500 format or something :)

Manu
Title: Re: Harrison Ford Filter Feeler
Post by: tsv on June 28, 2014, 01:07:35 PM
I just got my PCB's and parts from Dan. Great stuff!

I intrigued by the 'Bump' control on Harrison's version. I'm guessing it's some resonance in the HP circuit? Anybody know?

Thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: skal1 on September 15, 2014, 04:02:30 PM
yes they're  a self etch version , or schematic



cheers

skal1
Title: Re: Harrison Ford Filter Feeler
Post by: Marcocet on October 22, 2014, 09:38:10 PM
I find myself intrigued by this circuit - I reckon i'll be building it unbalanced too, and I'm going to try and use that fourth Opamp stage (which is, I think, unused, right?) for a little variable all-pass filter... might combine two channels' worth for a two-stage all-pass that can work on one of the channels rather like the ibp... is that nuts? all my filters in one basket....

How's that coming mute? If you sort that out I'd love to see it! I could use a simple, variable allpass, and I do have one or two spare boards floating around...
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on October 25, 2014, 06:00:50 AM
Hi I'm planning on attempting this awesome project, but I have no idea about power.

With regards to racking up 8, am I right in thinking that the boards draw 20mA each so I'd need a PSU that can supply 160mA?
Then I'll need something to convert the power to dual rail +/-15 v.
I'm based in Europe, so would something like this combination work?
http://www.audiomaintenance.com/acatalog/Power_Transformers_and_Chokes.html
With
http://diypartssupply.com/index.php?main_page=product_info&cPath=2&products_id=34

Or am I totally off track and need something completely different?
Title: Re: Harrison Ford Filter Feeler
Post by: shot on October 25, 2014, 12:50:47 PM
You need a power transformer that has two secondary windings with 15VAC or 18VAC. You'll connect that to the input rails of the PSU board like the one you linked. That board has to convert AC to DC, regulate the voltage and filter it a bit to provide you with two DC power rails - plus and minus rail.
Maybe you can score the power transformer locally, most of the electronic shops have some. Look for dual secondary (15+15 or 18+18) with at least 15VA (volt-amperes). That's the power rating of your transformer. Someone smarter than me can calculate minimum VA to supply at least 160mA...
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on October 25, 2014, 03:07:06 PM
Thanks Shot!
Ok figured out what I need now, and thought I'd share for other Europe based people.
Pretty damned cheap too :)
http://www.ebay.com/itm/AC-220V-Dual-AC-15V-Output-Transformer-5W-for-NE5532-AD82-Amplifier-Amp-Circuit-/371159747402?pt=BI_Circuit_Breakers_Transformers&hash=item566ad84b4a
&
http://www.ebay.com/itm/Power-Supply-Board-Kit-PCB-Based-on-LM317-LM337-IC-/260484989112?pt=US_Amplifier_Parts_Components&hash=item3ca61d80b8

:)
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 25, 2014, 03:13:30 PM
China/Hongkong is not in europe...... ::)
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on October 26, 2014, 07:40:57 AM
well with free postage it might as well be. And really I was refering to the Voltage  ::)
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 26, 2014, 10:34:29 AM
Hello,


where are you located?
Updating your profile helps.
For the psu,there are tons of infos here to find.For a smart lmxxx-based psu or just the pcb you might want to ask e.g. Volker(silent:arts) in Berlin or Cemal (sahib) in Glasgow.Tell them what you need and I'm sure they can help you.
For the transformer I'd personally prefer a torroid.Causes way less trouble when it comes to magnetic fields ("...why does ch.8 have a hum that is louder than on the first channel...." ;) ).
Don't know the specs for this build (where do the 20mAs come from,has anybody measured it?) but 5w for the transformer seems to be on the lowish side (at least I don't have a good feeling).
If you want to learn more a fool around with numbers I highly recommend Joe Malone's ac/dc calculator:


http://www.jlmaudio.com/ACDC%20Calculator.htm


As always be careful with mains voltages!


Have fun,


Udo.

Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on October 27, 2014, 12:49:46 PM
Thanks for the suggestions Udu  :) It's always good to know where one can get hold of parts. I'm in Norway, so customs are slapped on everything from everywhere!
Earlier in the thread Jensemannen said the draw was only 20mA per board. It's a pretty simple circuit with no hefty transformers so that doesnt seem so strange.
Interesting about the magnetic fields. I'll have a good listen to see how it pans out, and see if the power needs to be rethinked  8)
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 27, 2014, 01:28:55 PM
yep,


just in case hum occurs on the channel(s) closest to the transformer you can move or turn it a bit while listening to it.
Again,be careful with the mains voltages,they can kill you!
If moving doesn't help enough you might want to give it some shielding.
If your case is deep enough simply mount it at the most far away spot from all audio pcbs.Same for all audio wiring,e.g. don't run audio wires close or even across the transformer.
Strong twisting the wires or shielded caples are always helpful.


Have fun,


Udo.


P.S.:Didn't read the whole thread,but if Jens says 20mAs it is then trust him (Hi Jens!)  ;)
Anyway I'd still give the psu some headroom,maybe you're better off with a higher va transformer,just a thought.
Maybe something like TALEMA torroids (I use them often in my smaller builds),available in 10va and higher.
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 27, 2014, 02:14:17 PM
Oh,and if you want to go safe:
Build the circuits,but temporarily just attach one filterboard to the psu.
Measure the current,best under load and some hot signals running through it.
This way you'll have a "real world" condition.
Then multiply by 8,then again by say 1,5 or so to have some headroom.
Or use Joe's calculator.It tells you the estimated va value in the down left corner.
Or both,hahaha......


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on November 08, 2014, 05:28:07 AM
So Iv'e had some trouble working out how to power 8 of these boards. However I've managed to come up with what I think might work. Could anyone who's built a rack of these or got general nohow check over my drawing to see if it's ok?
Thanks
(http://groupdiy.com/gallery/0/49297-081114052411.jpeg)
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on November 10, 2014, 12:28:36 PM
bump  ;)
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on November 10, 2014, 01:52:22 PM
the chassis should be conected as close as posible of the IEC switch.
daisy chain the ground is not a good idea, star ground is a better option. I would do the same with the power rails but the benefit could be debatible.

I would put the led near the  power supply.
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on November 11, 2014, 03:03:30 AM
Thanks for your input 12afael
So you would suggest something more like this for the grounding? (http://groupdiy.com/gallery/0/49297-111114025913.jpeg) Or have I misunderstood 'Starground'?
Thanks
Tom
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on November 17, 2014, 12:10:10 PM
anyone?  ???
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on November 17, 2014, 10:09:08 PM
yep the ground wiring is ok for me.  as I said  I would do the same for the V+ and V- one wire from each pcb to the power supply. any noise should be filtered in every pcb but better if there is not noise to be filtered.  provably is not necesary but I feel better doing it that way.
Title: Re: Harrison Ford Filter Feeler
Post by: skizotom on January 15, 2015, 10:22:03 AM
I've got two channels wired up, powered, and ready to go. 

I'm seeing that the input pads are marked


 +       -
 o   o   o



So, (naturally?) I assume that the unmarked middle pad is ground ... but,  while testing the wiring on the inputs I'm noticing that the input pad marked negative (rightmost input pad, when looking from the top of the board) is tied to ground - and the middle input pad seems to be where the negative input is tied to the ICs.

Am I missing some basic Ohm's-Law-ish principle, or is the board mis-labeled?

I searched within the thread for "input ground" and "negative ground" but didn't turn up any info.


So there doesn't actually seem to be a definitive answer to this question.  just a confirmation that they are marked wrongly. Are both input and output actually:
o o o
+ - G
?
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on January 16, 2015, 10:15:52 AM
It's about time I finally finish this project (and 5 others collecting dust on the bench...). Haven't done any diy stuff for the last year.  I'm drawing a blank, so it's stupid question time!
Is 10VA enough for running 8 of these? I was looking at this guy: http://www.antekinc.com/an-0115/ but should I go for 25VA instead?
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 16, 2015, 10:18:45 AM
Minor_Glitch I would go bigger to just be on the safe side of running 8 at once. 
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on January 16, 2015, 10:29:06 AM
skizotom, Just the input pads have the wrong silk screen on them.  If you look at the bottom of the PCB or use your DMM you can see the ground pads are tied together. 

Correct wiring is:
INPUT         OUTPUT
 +   -    G        G   +    -
 o   o   o         o   o   o


I've got two channels wired up, powered, and ready to go. 

I'm seeing that the input pads are marked


 +       -
 o   o   o


So, (naturally?) I assume that the unmarked middle pad is ground ... but,  while testing the wiring on the inputs I'm noticing that the input pad marked negative (rightmost input pad, when looking from the top of the board) is tied to ground - and the middle input pad seems to be where the negative input is tied to the ICs.

Am I missing some basic Ohm's-Law-ish principle, or is the board mis-labeled?

I searched within the thread for "input ground" and "negative ground" but didn't turn up any info.


I hope that helps.
Title: Re: Harrison Ford Filter Feeler
Post by: minor_glitch on January 16, 2015, 10:30:02 AM
Minor_Glitch I would go bigger to just be on the safe side of running 8 at once.
Great, thanks!
Title: Re: Harrison Ford Filter Feeler
Post by: Rocinante on February 02, 2015, 11:52:46 AM
Hey all,
I'm building these in 500 series (so am wiring the pots off board and have found a source for dual 50k reverse log pots but they aren't the conductive plastic, is that alright? 
Has anyone tried pots other than the Omegs?

Dylan
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on February 02, 2015, 03:17:03 PM
personal note  "add note about the in and out connector on the pcb in the next pcb"

sorry guys!  :-[
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on February 02, 2015, 03:44:07 PM
Hey all,
I'm building these in 500 series (so am wiring the pots off board and have found a source for dual 50k reverse log pots but they aren't the conductive plastic, is that alright? 
Has anyone tried pots other than the Omegs?

Dylan
Aml 47k works fine
Title: Re: Harrison Ford Filter Feeler
Post by: snaper on March 16, 2015, 04:13:31 AM
Hi Guys,


Quick question, regarding the schemo.
If I would like to use this with line levels (in a diy summing mixer), can I just simply omit the INA and DRV ICs?
Title: Re: Harrison Ford Filter Feeler
Post by: 12afael on March 16, 2015, 11:53:11 AM
if your system is unbalanced yes. it is an exact copy of the harrison filter.  you should check your source and input impedance of the surrounding circuit to maintain the performance (low impedance source and high input impedance ~10k)
Title: Just finished my 8 channel Harrison Ford Filter
Post by: kdramsey on October 25, 2015, 03:56:17 PM
Completed 8 channel Harrison Ford Filter.  I am real happy with the way it turned out!

Has anyone else using Dan's case noticed that the .050 marking for the HPF appears to be wrong? Instead it is labeled .50 which would indicate 500Hz unless I am missing something...

(http://i1248.photobucket.com/albums/hh492/kdramsey540/image_zpsoihwd2in.jpeg)

(http://i1248.photobucket.com/albums/hh492/kdramsey540/image_zpsnd0zpf1m.jpeg)

(http://i1248.photobucket.com/albums/hh492/kdramsey540/image_zpspwwovhkq.jpeg)

(http://i1248.photobucket.com/albums/hh492/kdramsey540/image_zpspb2s2hau.jpeg)
Title: Re: Harrison Ford Filter Feeler
Post by: guilds100 on November 01, 2015, 04:58:17 PM
Does anyone have a good source for the ICs on the bom. I would like to build this unit but cant source all the chips.
Title: Re: Harrison Ford Filter Feeler
Post by: john12ax7 on November 01, 2015, 05:16:46 PM
Does anyone have a good source for the ICs on the bom. I would like to build this unit but cant source all the chips.

Mouser should have everything
Title: Re: Harrison Ford Filter Feeler
Post by: guilds100 on November 01, 2015, 07:12:51 PM
Does anyone have a good source for the ICs on the bom. I would like to build this unit but cant source all the chips.

Mouser should have everything


I checked mouser and they dont have the tl074p
Title: Re: Harrison Ford Filter Feeler
Post by: john12ax7 on November 01, 2015, 07:28:09 PM
It seems they don't have the DIP version anymore, but looks like Digikey does.

You could also substitute other good quad jfet opamps.
Title: Re: Harrison Ford Filter Feeler
Post by: Harpo on November 01, 2015, 08:24:36 PM
http://www.mouser.de/ProductDetail/Texas-Instruments/TL074CN/?qs=sGAEpiMZZMtCHixnSjNA6NVXWo9AXLOeoUCxMTuUhxw%3d (http://www.mouser.de/ProductDetail/Texas-Instruments/TL074CN/?qs=sGAEpiMZZMtCHixnSjNA6NVXWo9AXLOeoUCxMTuUhxw%3d) about 20000 stock ...
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on November 02, 2015, 02:58:47 AM
btw: I'm very glad I built 2ch of this.
Just comes so handy in the studio :)
Title: Re: Harrison Ford Filter Feeler
Post by: elskardio on November 10, 2015, 07:31:35 AM
Hello,
Does anyone have a drilling template for the Harrison filters?
Thanks
Title: Re: Harrison Ford Filter Feeler
Post by: petermontg on November 18, 2015, 01:18:36 PM
Any boards left??
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on November 18, 2015, 02:01:36 PM
Any boards left??
http://collectivecases.com/?product=harrison-ford-filter-pcb
Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on November 18, 2015, 02:03:21 PM
I'd just like to chime in and say I'm very glad I built a pair of these.
So handy to have around.

Thanks a lot to you who made the project possible!
Title: Re: Harrison Ford Filter Feeler
Post by: discocubist on November 24, 2015, 03:17:20 PM
Hi guys, great project, extremely useful tools...

I wondered, any chance for an update, to add the 'bump' type resonance boost from the new harrison unit? I have found that the HPF (which is lovely) would be even nicer if I could dial in a bit of resonant just-above-the-cutoff lift ...

Could have implications for the 8 channel chassis, but...

If not, any brave takers on how to implement this solo...I can follow a picture and solder but adding to the circuit could see me jump 50 yards into the air and scatter myself over a large area
Title: Re: Harrison Ford Filter Feeler
Post by: EmRR on November 24, 2015, 03:33:34 PM
It already has a bump.  I don't know what the new unit does or doesn't add.  It may 'take away' instead. 
Title: Re: Harrison Ford Filter Feeler
Post by: discocubist on November 24, 2015, 03:54:58 PM
Thanks Doug! Looks like I need "MORE BUMP"

No idea how the new harrison box differs circuit wise from this - and i'm happy with how they sound, was just a musing...
Title: Re: Harrison Ford Filter Feeler
Post by: discocubist on February 25, 2016, 05:23:22 PM
Hi guys back again.

I've just built an 8 channel kit to go with the unit I got ready built and am ready to get to the PSU. I wondered whether I would be better off using an outboard PSU to avoid the noise issues Peterson talked about.

What should I consider or is it purely a case of finding a supply with the right capacity? I would prob just drill a hole in the back and use a locking connector of some sort connected to a 'line lump' as they call it.

Any insight welcome :) look forward to powering this beast and seeing if it beats the unit I have already which is def a little noisier than some of my pro pieces.
Title: Re: Harrison Ford Filter Feeler
Post by: kdramsey on February 25, 2016, 07:56:04 PM
Hi guys back again.

I've just built an 8 channel kit to go with the unit I got ready built and am ready to get to the PSU. I wondered whether I would be better off using an outboard PSU to avoid the noise issues Peterson talked about.

What should I consider or is it purely a case of finding a supply with the right capacity? I would prob just drill a hole in the back and use a locking connector of some sort connected to a 'line lump' as they call it.

Any insight welcome :) look forward to powering this beast and seeing if it beats the unit I have already which is def a little noisier than some of my pro pieces.

I put my power supply inside the 1u rack and it works great with no noise issues.  Pics of my build are in this thread a few pages back.  Here is a link to the power supply kit and the transformer I used. 

http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2054502.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=Symmetric+1A+Power+Supply+Kit+%28+K8042+%29&_sacat=0

http://www.antekinc.com/an-0124-10va-24v-transformer/

You could still build these into an external box if it ended up being noisy mounted internally...


Title: Re: Harrison Ford Filter Feeler
Post by: G-Sun on July 23, 2016, 01:57:47 PM
I have 2ch HFF
and both bypass-switches are not functioning right.
They're not latching, only working if I hold them in.
It's these kind: http://www.audiomaintenance.com/acatalog/AL-03-002_extended_info.html

Should I presume I need to replace them,
or can I fix them?
Title: Re: Harrison Ford Filter Feeler
Post by: mattmartin831 on June 06, 2017, 04:21:33 PM
Anyone know if these will work properly with a +/- 16VDC supply? I have a 16V psu for my access 312 preamps and I'm wondering if I can just use a second output Jack to connect these filters to power from the same supply
Title: Re: Harrison Ford Filter Feeler
Post by: elskardio on June 06, 2017, 08:58:20 PM
Anyone know if these will work properly with a +/- 16VDC supply? I have a 16V psu for my access 312 preamps and I'm wondering if I can just use a second output Jack to connect these filters to power from the same supply

All the ICs are rated at Max +/- 18V DC. It should be fine.
Title: Re: Harrison Ford Filter Feeler
Post by: febo2609 on June 09, 2017, 04:08:22 PM
Do you have pdf or gerber file of this filter to share with as for homemade pcbs
Thanks  in advance
Title: Re: Harrison Ford Filter Feeler
Post by: mattmartin831 on June 14, 2017, 09:09:28 PM
I bought the Harrison Ford Filters case from collective cases. Do the High Pass and Low Pass values printed on this case match up with the taper of a linear pot or a reverse log pot?
Title: Re: Harrison Ford Filter Feeler
Post by: sr1200 on June 21, 2017, 03:10:52 PM
Unless the project has undergone a major over haul, from page 1:
Quote
47k Rev Log pots
Title: Re: Harrison Ford Filter Feeler
Post by: danijel on October 04, 2017, 09:23:28 AM
Just finished. Sounds great, really useful. 8)

Thanks to 12afael, Marcocet, Jensenmann and everybody who contributed to this nice project.

Front panel is from Frontpanels.de, and the psu is made from silent:arts pcb.

Pics:

(https://i.imgur.com/jaLNABt.jpg)

(https://i.imgur.com/dhiir5U.jpg)
Title: Re: Harrison Ford Filter Feeler
Post by: jensenmann on October 04, 2017, 11:44:59 AM
Congrats, well done!!!
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 04, 2017, 11:55:58 AM
Yes,well done!
I like the external psu.Should keep things quiet.
The pics' resolution seems a bit low,may I ask which way you went for i/o (THAT,INA,DRV etc.....?)?


Best regards,


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: danijel on October 04, 2017, 12:55:16 PM
Thanks!

 THAT  for i/o.
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 04, 2017, 01:10:49 PM
Thanks!

 THAT  for i/o.
1246 & 1646,yes?
I'm about to build some soon so wanted to know if the +6dB-"issue" is solved.....


Thank you,


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: danijel on October 05, 2017, 10:49:02 AM
1246 and 1646. It's ok. There is no issues.
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 05, 2017, 10:54:27 AM
Thank you very much indeed,
best regards,


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: mattmartin831 on October 05, 2017, 08:49:22 PM
Do these work with both mic level signals and line level signals? Or just one or the other?
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 06, 2017, 12:42:22 PM
Do these work with both mic level signals and line level signals? Or just one or the other?
Line level.
Title: Re: Harrison Ford Filter Feeler
Post by: dogfaceaudio on October 08, 2017, 05:28:13 PM
Does anyone have info on dimensions for drilling a front panel? Thanks.
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 12, 2017, 01:43:26 PM
Does anyone have info on dimensions for drilling a front panel? Thanks.
Hello,
I only have the pitch between the pots which is 0,8 inches or 20,32mm.
No data for the e-switch position,I don´t use it,sorry.


Best regards,


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 12, 2017, 02:01:49 PM
I thought I should share some results.
Have built them a couple of days ago.
Thanks to everybody here for this nice project,I did the first with some ic-sockets to experiment with caps and ended with the values Jens recommended here (thanks for that Jens,very useful especially on the ccw end of the hpf).
I went for THAT 1246 and 1646 for i/o,LT1058 as 074 replacement.
Did not use the bypass because with hpf to ccw and lpf to cw you already have a (pleasant sounding) little curve,so I will do a hard bypass later.
I did some rough measurements,no housing/shielding yet,running from a lab psu.
It shows the bumps nicely or better said why people like the sound.


Best regards,


Udo.


Here´s the curves for hpf (lpf is set fully cw):
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 12, 2017, 02:03:23 PM
…and the curves for lpf (hpf is set fully ccw):
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 13, 2017, 11:57:34 AM
Nice work, Doug. 
So a  INA137 or THAT1246 on the input gives unity gain (instead of INA134, which is +6dB).

Those 134 chips are expensive - maybe the BOM on the first page could be updated?
Excactly,and +1 on updating the bom!
And thanks to Doug for pointing this out of course!


Best regards,


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: dogfaceaudio on October 13, 2017, 06:22:41 PM
Anyone have a source for the 47K Rev. Log pots? Audiomaintenance is out.
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on October 14, 2017, 01:24:44 AM
Anyone have a source for the 47K Rev. Log pots? Audiomaintenance is out.
Hello,I found this some minutes ago:


http://www.audiomaintenance.com/acatalog/om%2d01%2d028%5fextended%5finfo%2ehtml


Also I received a bunch of them yesterday,doesn't look like they're all gone.


Best regards,


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: leighgreen on November 07, 2017, 08:30:33 AM
Hi, could I please buy some of these? I've asked a few times but nobody has answered me.

Thanks!

It looks like 12afael, Jens and I finally have a production version of this PCB ready and we're about to place an order for ourselves. Essentially it's a clone of the classic Harrison sweepable filters. The board runs on +/- 15v, has extremely few parts, and is tiny enough to fit a bunch in a rack case. It could also easily be built into a 500 series module. The hardest parts to source are the 47k Rev Log pots, which are available at Audio Maintenance (thanks Colin!).

I'm not trying to run a shop or anything, but if anybody would like a few boards I can figure out a price and add them in to our order. Please feel free to PM me or email me at strangeweathersound @t gmail.



EDIT:

Boards are sold out. Here's the BOM. I've attached an excel copy too for those who are that way inclined.

5   10k           R1, 2, 6, 7, 9   
4   390           R3, 4, 5, 8   

9   0.1u           C1, 2, 6, 7, 11, 12, 13, 15, 16   
1   100p           C3   
1   0.012u   C4   
1   0.047u   C5   
2   100u   C8, 9   electrolytic
1   10u           C10   electrolytic

2   50k Dual Lin   LOPASS, HIPASS   Audiomaintenance.com
1   ESWITCH 2 pole   switch   Audiomaintenance.com

1   INA134P   IC2   
1   TL074P   IC1   
1   DRV134PA   U$1   

http://strangeweatherbrooklyn.com/sales/HarrisonFilterBOM.xls (http://strangeweatherbrooklyn.com/sales/HarrisonFilterBOM.xls)


schematic here (http://strangeweatherbrooklyn.com/sales/harrisonfordfilter.jpg)
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on November 07, 2017, 12:36:10 PM
Hi, could I please buy some of these? I've asked a few times but nobody has answered me.

Thanks!
Who did you ask?


Here's what I found a few minutes ago:


http://cc.fourfourmedia.com/?product=harrison-ford-filter-pcb&removed_item=1 (http://cc.fourfourmedia.com/?product=harrison-ford-filter-pcb&removed_item=1)


Udo.
Title: Re: Harrison Ford Filter Feeler
Post by: dandeurloo on November 07, 2017, 03:08:24 PM
I do have them and kits in stock!

;)
Title: Re: Harrison Ford Filter Feeler
Post by: kante1603 on January 11, 2018, 01:46:58 PM
skizotom, Just the input pads have the wrong silk screen on them.  If you look at the bottom of the PCB or use your DMM you can see the ground pads are tied together. 

Correct wiring is:
INPUT         OUTPUT
 +   -    G        G   +    -
 o   o   o         o   o   o



I hope that helps.


Hello,


just for info:


The output pins seem to be wrong too, + and - are swapped.
On a 1646 output positive is on pin 8(and 7),negative goes to pin 1(and 2).
Found it today having two filters on a stereo signal and bypassing one if them (hard bypass,insert on one channel temporarily switched off in ProTools).
I then looked at the ic pinouts and measured to the board connectors,found it.
So input is correct as stated in Dan's post above,the output isn't.
 
Best regards,


Udo.