Case mods have been all the rage with hardcore gamer PCs for several years. Hot rods inspired the craze with neon running lights and license plate frames. Well now the crazed has crossed the chasm into the Ether... Etherwave case mods, that is!
Using an Arduino based circuit, hardware hacker Joe Saavedra pimped out his Moog Etherwave Theremin with a new clear/frosted acrylic top and 2 RGB LED lights. The circuit reads control voltages from the Etherwave and adjusts the lights based on your playing.
Calling out to Joe - care to make this an official aftermarket product? The theremin market needs more of this type of accessory!
To create your own hot-rodded Frankentheremin case, follow Joe's instructions here.
Via: Make Online
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What he calls an OPamp is an OTA. At Pin5 he doesn't get a control voltage as he tells but the audio signal behind the VCA whose DC level varies also a bit with the volume since Pins 3 and 4 are not offset compensated. Pin 5 is an unbuffered current output. That means that each additional resistance will degrade the signal. A better way to get a stable volume CV is to bridge the VCA out and the AMP in Pins at the extension connector, and pulling the AMP out with a 10k resistor towards the -12V Pin in order to get a real volume CV which varies from -12V (mute) to +12V (max volume).
Wiring the second LED from the far left side where the additional circuit board adds already parasitic capacitance to the volume loop and its linearization coils, to the far right side risks also to mess up the pitch field.
So be rather careful with this mod if you are what is often called a "precision player".