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BackDays ($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 Hardware/lib/Kosmo_panel | 1 uF | Unpolarized capacitor | | | | | | R5 | 1 | LED | Light emitting diode Push button switch, generic, two pins