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That one uses a CA3080 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 Latest commits for file Panels/fireball_vco_14hp_v1.scad adds front panel Added schmancy pcb for v1 build - C1 is too small; need more than the Dailywell SPDT. | R31 | 1 | 2_pin_Molex_header | KK254 Molex connector | | | | | R24, R26, R28 | 3 | A1M.

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