This one is not new, but I don't believe I've posted it in the past. It recently came up on the SDIY email list as a simple affordable DIY VCO."The VCO-1: An Uncomplicated VCO That Truly Delivers
Designed By Thomas Henry
Preface: Towards the end of May, 2007 I began to grow excited over the possibilities the summer of 2007 might hold. Through fall, winter and spring, Thomas Henry pursues his career of teaching mathematics in Mankato, Minnesota, but during the brief respite he has from that over summer, he always manages to unleash some new design that has been tickling his imagination throughout the school year. In the summer of 2006, Thomas developed the XR VCO, the SN-Voice, the UD-1 Drum Voice, then nonchanlantly capped off the season with a design *for an entire synthesizer* that contained two different VCOs, a phase shifter, a VCA, a multi-mode filter, a very unique LFO (which would occupy many pages ot text just to describe all of its uses), a sample and hold, a power supply, and a digital noise circuit, the specifications of which are quite astounding. This collection of schematics turned into the publication "An Analog Synthesizer for the 21st Century" which will be available from Magic Smoke Electronics towards the end of Summer 2007.
So, I was not terribly surprised (but very pleased) when Thomas contacted me about a design he wished to make freely available to the public. He sent me the schematic, and I was amazed to see what appeared to be a very simple little VCO circuit..."
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