kante1603

Re: Harrison Ford Filter Feeler
« Reply #360 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.


Re: Harrison Ford Filter Feeler
« Reply #361 on: October 08, 2017, 05:28:13 PM »
Does anyone have info on dimensions for drilling a front panel? Thanks.

kante1603

Re: Harrison Ford Filter Feeler
« Reply #362 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.

kante1603

Re: Harrison Ford Filter Feeler
« Reply #363 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):
« Last Edit: October 12, 2017, 02:07:09 PM by kante1603 »

kante1603

Re: Harrison Ford Filter Feeler
« Reply #364 on: October 12, 2017, 02:03:23 PM »
…and the curves for lpf (hpf is set fully ccw):

kante1603

Re: Harrison Ford Filter Feeler
« Reply #365 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.

Re: Harrison Ford Filter Feeler
« Reply #366 on: October 13, 2017, 06:22:41 PM »
Anyone have a source for the 47K Rev. Log pots? Audiomaintenance is out.

kante1603

Re: Harrison Ford Filter Feeler
« Reply #367 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.

Re: Harrison Ford Filter Feeler
« Reply #368 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


schematic here

kante1603

Re: Harrison Ford Filter Feeler
« Reply #369 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


Udo.


dandeurloo

Re: Harrison Ford Filter Feeler
« Reply #370 on: November 07, 2017, 03:08:24 PM »
I do have them and kits in stock!

;)
PROFESSIONAL CHASSIS AND FRONT PANELS FOR DIY PROJECTS: WWW.COLLECTIVECASES.COM

Dan Deurloo
www.collectivecases.com
www.risendrums.com

kante1603

Re: Harrison Ford Filter Feeler New
« Reply #371 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.
« Last Edit: January 11, 2018, 02:10:54 PM by kante1603 »


 

Related Topics

  Subject / Started by Replies Last post
12 Replies
5676 Views
Last post October 18, 2010, 09:54:48 AM
by johnR
6 Replies
4009 Views
Last post May 25, 2012, 06:16:21 AM
by G-Sun
2 Replies
2027 Views
Last post September 15, 2014, 04:17:05 PM
by skal1
1 Replies
469 Views
Last post May 10, 2018, 07:46:52 PM
by BricktopRecording