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OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 Latest commits for file Schematics/MK_VCO_RADIO_SHAEK_try1.diy Binary files /dev/null and b/Datasheets/tl074.pdf differ Binary files a/3D Printing/Panels/FIREBALL VCO.png | Bin 0 -> 26572.

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