we made this for our friend, jenn. she plays the accordion (and did the artwork for the thermal detonator). jenn asked us if we could figure out a way to allow her to amplify the sound without having to stand in front of a microphone all the time. after some research, we found that two microphones were better than one inside of an accordion. so we attached two directional electret condenser microphones to a stereo 1/4″ phono jack. a stereo cable will connect this jack to the stereo 1/4″ input phono jack on the mixer. both signals can be individually attenuated (that’s what the knobs are for: left/right volume controls). from there, the two audio signals will be combined into a mono signal. just plug the output of the mixer into an effects pedal or two…or directly into an amplifier with a mono cable. now jenn can walk around when she plays.
this setup requires a 9v power supply (only battery for now). to conserve battery life, just unplug the mono cable from the output jack when not in use.