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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 schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 | 4.7k | Resistor | | | U3 | 1 | 3_pin_Molex_header | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/> Audio Jack, 2 x 6mm drills 3 pin Molex header 2.54 mm spacing D 3 pin Molex header 2.54 mm spacing | Tayda | A-1624 or A-2969 | | | | | | R1, R10, R11 | 3 | A1M | \*\*Potentiometer, 16 mm vertical board mount OR: | | J7 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x4 | | | | Tayda | A-1531 or A-557 | synth_tools/Schematics/SynthMages.pretty/Micro SPDT (3 pin).kicad_mod Normal file Unescape Hardware/Panel/precadsr-panel/fp-lib-table Normal file View File Schematics/SynthMages.pretty/Switch.dcm Normal file Unescape DEF Kosmo_panel_Jack_Hole H 0 40 Y N 1 F N DEF SW_DIP_x02 SW 0 20 Y Y 1 F N DEF SW_DIP_x04 SW 0 40 Y N 1 F N DEF SW_DIP_x07 SW 0 40 Y Y 1 F N DEF SW_DIP_x02 SW 0 0 Y N 1 F N DEF SW_DIP_x11 SW 0 1 Y Y 1 F N DEF SW_SPST_Temperature SW 0 40 Y N 1 F N DEF SW_Reed_SPDT SW 0 40 Y Y 5 N DEF.

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