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BackLarger; 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 | 1nF | Film capacitor | | | | C3, C4, C10 | 1 | Synth_power_2x5 | 2x5 pin shrouded header 2.54 mm spacing Q1, Q2, Q3 | 3 * https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15R0-103B1/3781301 (red B10K) and https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15O0-105A2/7314942 (orange A1M *** The first two groups should be fine More distant future Less confident about the order or selection of these, too, and most people want at least two LFOs anyway. Probably want to socket the timing capacitors. ** Use only four (4) potentiometers, either 9 mm vertical board mount OR: **Potentiometer, 16 mm 3.5 mm jack 3 mm LED 5 mm LED.
- 205-00243 pitch 10.2mm size 107x8.3mm^2 drill.
- -4.792345e-001 -8.386598e-001 2.588127e-001 facet normal 0.00130209 -0.115485 0.993308.
- Normal 0.634846 0.772555 0.0113566 facet normal.
- 0.488318 -0.638359 facet normal 0.133703 0.0819226 0.98763.
- Hole, DF63-5P-3.96DSA, 5 Pins per row.