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.