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Holes in footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals - 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 | 10uF | Polarized capacitor | | | | C3 | 1 | Synth_power_2x5 | 2x5 pin shrouded header 2.54 mm spacing | Tayda | A-804 | | | | | | | R3, R7 | 3 | AudioJack2 | Audio Jack, 2 x switching (normalling) stereo jack (T/TN/R/RN/S), https://www.neutrik.com/en/product/nj5fd-v 6.35mm (1/4 in) Vertical Jack, 2 Poles (Mono / TS) | | | S3 | 1 | SW_Push | Push button switch, generic, two pins | Dailywell | PAS7B3M1CESA6-5 | Tayda .

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