Here you go...these are the instructions for the dmic 20 adjustable gain knobs.
This is compiled of exerts from a couple of different emails.
hope this helps
note: the "I" in the rest of this is not me, I have not done this mod yet, but soon
mail#1
i have no schematics but heres the deal. the dmic has adjustment pots in it. crack the case open and see r65 and r66.
unsolder them and get replacements rated at 5k ohm .25watt.
mount them on the front panel and connect wires to the holes where the old pots were and your in business.
go to
http://www.routeflap.net/dmic20/ to see pics.
mail#2
i decided to add those new pots with nice knobs to the front panel instead of the trimmers from inside.
the pots seem to be $5 ea./knobs $2 from various places on the web. i'm using Calrad 25-395 5K ohm dual audio taper 1/4 watt. dont need the dual taper, but couldnt find a single taper that was small enuf, etc.
the knobs are Calrad 85-591 $2.25 (thats whats on the dmic in the pics on the website i posted) i verified with GP engineering that those trimmer pots were 5K ohm 1/4 watt of course
mail #3
i get the calrad pots from cablesandconnectors.com
made by Calrad, part# 25-395 (5k ohm dual audio taper 0.25 watt)
they 'dual' which means they have 2 sets of contacts, but u only wire
one set obviously. i couldnt find a single taper pot that was the same
specs and the perfect size to fit good. there is no issue with it being
dual..
just means 2 sets of contacts in case u wanna connect right and left to
the same pot. ie: stereo volume knob. wire it to either set of
contacts.
the knobs that i used are calrad part# 85-591 they come in different
colors tho depending on the part #.
Bean...tell us how it turns out!!!!