found a TL081/LM741 preamp schem....

[onboard]

...drawn by Bob Blick that may be inspiring. A trim pot or off-board pot at the 1M resistor between pins 2 and 6 would be cool, or a volume control at the end. Or splicing the whole thing or parts into any one of a zillion other circuits  :wink: Did anyone build Donnie James' low battery indicator yet btw? I'm still working on messing with this preamp...