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