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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 Envelope/Envelope.kicad_pcb | 2 Hardware/lib/Kosmo_panel | 1 | 100k | Resistor | | | U3 | 1 | 1 Hardware/lib/aoKicad | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md | | | J12 | 1 | 1 | SW_SPDT | SPDT miniature toggle switch | | | | J12 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch | | | | | | Tayda | A-2939 | | | S2 | 1 | SW_3PDT_x3 | Switch, triple pole double throw, separate symbols | | | | Tayda | A-4755 | | | Tayda | A-1605 | | | J7 | 1 | SW_Push | Push button switch, generic, symbol, four pins D Momentary Switch, dual pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS) | | | | | | Tayda | A-3486 or A-3487\*\*\* | | | | C2 | 1 | Synth_power_2x5 | Pin header, 2.54 mm, 1x7 | | 2 main MK_VCO/Panels/Font files/Futura XBlk BT.ttf differ Binary files /dev/null and b/Panels/FireballSpell_Large_bw.xcf differ From 2ce1144628c5b348c6a2166a7b906cc45e80a76d Mon Sep 17 00:00:00 2001 Subject: [PATCH] Change op amp, dims to user drawings Hardware/PCB/precadsr/potsetc.sch | 84 Hardware/PCB/precadsr/precadsr.sch | 4 | 1M | Resistor | | L1 | 1 Hardware/PCB/precadsr/sym-lib-table | 1 README.md | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35 Pin header 2.54 mm spacing | Tayda | A-553 | .

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