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Had long enough terminals, barely, to poke through the board, cross at 90° to minimize capacitance between traces - .3mm for non-power lines, .6mm if carrying power - MK 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 .../Unseen Servant/Unseen Servant.kicad_sch | 864 Schematics/Unseen Servant/fp-info-cache | 1 | SW_DPDT_x2 | Switch, triple pole double throw, separate symbols K switch dp3t ON-ON-ON D Switch, single pole double throw, separate symbols 2x5 pin shrouded header 2.54 mm spacing | | | R24, R26, R28 | 3 | A1M | \*\*Potentiometer, 9 mm vertical board mount | | R8, R10, R12 | 3 | 100R | Resistor | | | | | | J11 | 1 | SW_Push | Push button switch, push-to-open, generic, two pins K switch normally-open pushbutton push-button LCD illuminated right angle Molex 0.50mm Pitch Easy-On Type FFC/FPC Connector, For LVDS, 2.33mm Height, Right Angle, Surface Mount, http://www.molex.com/pdm_docs/sd/1054440001_sd.pdf USB TYPE C, USB 2.0, SMT, https://www.jae.com/en/connectors/series/detail/product/id=91780 USB C Type-C USB3 receptacle SMD USB Micro-B receptacle, through-hole.

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