Oct. 16, 2013, 4:11 a.m.
For the first part of my modular synth exploration, I wanted a cheap and simple VCO (Voltage Controlled Oscillator) that used only parts I had on hand. After some searching I found this design: http://electro-music.com/forum/topic-41483.html&postorder=asc It only uses two op amps and some other parts I had on hand. I threw it together on the breadboard pretty quick and it seems like a decent start towards my goal of making the cheapest and most simple modular synth I can. Listen to a demo below.