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- avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals PCB layout: make power connection traces larger; 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 | 4.7k | Resistor | | J1 | 1 | SW_SPDT | Switch, triple pole double throw Precision Timers, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 A-1135 2 8 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see [build notes](build.md | | Tayda | A-3588 | | AR Path="/607F01E7" Ref="R?" Part="1" AR Path="/607ED812/60A9C0A9" Ref="R11" Part="1" AR Path="/607ED812/60970E37" Ref="S3" Part="1" AR Path="/607ED812/60800A40" Ref="R113" Part="1" AR Path="/60970E37" Ref="S?" Part="1" AR Path="/607ED812/60A9C081" Ref="R26" Part="1" AR Path="/607ED812/60B160FF" Ref="J10" Part="1" AR Path="/607ED812/60A9C0A9" Ref="R28.

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