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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 schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 pin Molex header 2.54 mm spacing DEF 2_pin_Molex_connector J 0 40 Y N 1 F N DEF SW_Coded_SH-7080 SW 0 0 Y N 1 F N DEF LM3900N U 0 40 Y Y 1 F N DEF SW_Rotary12 SW 0 20 Y N 1 F N DEF SW_SPST_LED SW 0 20 Y N 1 F N DEF Synth_power_2x5_passive J 0 40 Y N 1 F N DEF Synth_power_2x5_passive J 0 40 Y N 1 F N DEF SW_DIP_x11 SW 0 0 Y N 1 F N DEF SW_Push_Dual SW 0 0 vertex 2.42705 -1.76336 9.999 vertex -0.927051 2.85317 0 vertex -1.21798 -6.38487 20 vertex 2.76756 5.88138 20 vertex 4.14326 5.00834 19.9 facet normal -0.532832 -0.843291 -0.0703581 vertex -3.44477 -9.2078 1.51264 facet normal 5.021498e-001 -8.602263e-001 8.863533e-002 vertex -2.718918e+000 3.026667e+000 2.470218e+001 facet normal 2.548140e-001 4.466467e-001 8.576576e-001 vertex -5.179446e+000 2.930032e+000 2.492316e+001 facet normal 0.705391 0.0694748 0.705406 facet normal 0.769324 -0.631369 0.0975348 vertex -7.4445 5.04732 4.51216 facet normal -0.584869 0.805011 0.0994257 facet normal -1.000000e+000 0.000000e+000 0.000000e+000 vertex 2.602059e+000 5.001575e+000 2.496000e+001 vertex 2.937280e+000 6.404036e+000 2.496000e+001 vertex 4.735710e+000 -3.162953e+000 2.496000e+001 vertex 1.612724e+000 6.851379e+000 9.983999e+000 vertex 3.541821e+000 4.395136e+000 2.496000e+001 vertex -2.840534e-007 -7.987200e+000 9.983999e+000 vertex -6.577143e-001 5.585604e+000 1.747200e+001 facet normal 0.172963 0.0922671 0.980597 vertex -5.0946 -5.35022 6.88312 facet normal 0.0580967 0.0922853 0.994036 facet normal -0.956976 -0.290168.

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