...drawn by Bob Blick that may be inspiring (http://www.bobblick.com/techref/projects/preamp/preamp.html). 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 (http://www.designnotes.com/CIRCUITS/lowbat.htm) yet btw? I'm still working on messing with this preamp...