Here is my Aquaboy build (v3205). I socketed R19 (1K, VD: 7.89V) and put a trimpot instead of the feedback resistor. Worked right away, but the overall volume was below unity, the problem being that R37 was 150K instead of 150R! (see recent post on tech help).
Thanks to Brian for making this and other projects possible.
Costantino
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Very nice! Good work ;D
Josh
Great work! It's good to see some pics of the AB. Not to many show up here.