Theremins - Info on some the theremins I've built 

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Keppinger Tube Theremin   Information and Build Log  Keppinger Tube Theremin Hand Wound Coil Sets EM/ Etherwave Theremin * "Build the EM Theremin" 1996 article my Bob              Moog *  "Understanding, Customizing and Hot-rodding Your Etherwave Theremin" Forbes Vacuum Tube Theremin * Schematic * Build Notes * My Power Supply Mod * My build report on DIY Stompboxes.com