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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 | 4.7k | Resistor | | | R16, R18, R26 | 3 | 100R | Resistor | | | R17, R19 | 3 | A1M | **Potentiometer, 9 mm or 16 mm vertical board mount 3PDT miniature toggle switch | | | | | L1 | 1 README.md | 29 .../ao_tht.pretty/LED_D5.0mm.kicad_mod | 34 ...E-6410-02A_1x02_P2.54mm_Vertical.kicad_mod | 49 ...E-6410-03A_1x03_P2.54mm_Vertical.kicad_mod | 53 ...E-6410-08A_1x08_P2.54mm_Vertical.kicad_mod | 79 .../MountingHole_3.2mm_M3.kicad_mod | 17 .../precadsr_panel_al/precadsr_panel_al.sch | 194 .../precadsr_panel_al-B_SilkS.gbr | 472 aoKicad | 1 nF | Unpolarized capacitor | | J2 | 1 | B20k | Potentiometer | | S1 | 1 | B20k | Potentiometer | | | | | | | J3, J4, J5 | 3 | 2_pin_Molex_header | KK254 Molex connector 2.54 mm spacing Pin header 2.54 mm spacing"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x4 | | | R4, R12, R13 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 Quad operational amplifier, DIP-14.

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