[sdiy] Cooking pots

[Paul Perry]

Erik Dower - who started this thread - appears to be havign some trouble 
posting to the list. He's asked me to send this for him:

Erik:
"I thought about filing off the material but I'm not sure how good of a 
solution it is to open up a quad bourns sealed pot.  I've never attempted 
such a thing but it seems perhaps as messy as my proposal?


The pot is in a feedback path of an opamp in one band of an EQ.  The band 
goes from -infinity to +6db with center detent @ 0db, and the goal is to get 
more gain out of it.  Here's the schemo: 
http://www.muffwiggler.com/forum/userpix/1370_screen_shot_20110911_at_92828_pm_1.png


I could do something with a vactrol and an opamp and perhaps a few other 
bits to get the bias right, but this mixer has 4 stereo channels with 2 
bands each so doing the mod 16 times with much complexity is not very 
feasible.


I was hoping someone somewhere had spent some time developing a technique 
for burning through these to increase resistance and get custom values."

Well that is what Erik says.. but I am still pretty sure that the original 
circuit could be modified to do what he wants, using the ganged pot he has.
But I'm not the man who can do it..

paul perry Melbourne Australia

paul perry Melbourne Australia