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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 pin Molex header 2.54 mm spacing Pin header 2.54 mm spacing | | Tayda | A-3588 | \** Use only four (4) potentiometers, either 9 mm vertical board mount module ACDC-Converter, Murata, 5W, ClassB, https://www.murata.com/products/productdata/8809982558238/KAC-BAC05.pdf switching power supply tht Constant current LED Driver DC/DC Converter, https://g.recomcdn.com/media/Datasheet/pdf/.fYUQjOlW/.t2a80a771bdbb0ef300f7/Datasheet-93/RCD-24.pdf DCDC-Converter, 30W POE, Silvertel, pitch 2.54mm, package size 11.5x8.5x17.5mm^3, https://www.recom-power.com/pdf/Innoline/R-78HBxx-0.5_L.pdf DCDC-Converter, RECOM, RECOM_R-78E-0.5, SIP-3, pitch 2.54mm, size 15.7x6.2mm^2, drill diamater 1.4mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block WAGO 804-109 45Degree pitch 7.5mm size 22.5x10.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00078 pitch 10mm size 95x8.1mm^2 drill 1.3mm pad 2.6mm terminal block Metz Connect Type171_RT13704HBWC pitch 7.5mm size 89x15mm^2 drill 1.2mm pad 3mm Terminal Block WAGO 236-414, 45Degree (cable under 45degree), 1 pins, pitch 3.5mm, size 49x7.6mm^2, drill diamater 1.15mm, pad diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00045_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block 4Ucon ItemNo. 10702 vertical pitch 5mm Varistor, diameter 7mm, width 4.9mm, pitch 7.5mm Varistor, diameter 9mm, width 3.9mm, pitch 7.5mm Varistor, diameter 9mm, width 5.7mm, pitch 5mm Varistor, diameter 7mm, width 3.4mm, pitch 5mm size 30x12.5mm^2 drill 1.4mm pad 2.7mm terminal block RND 205-00240, 10 pins, pitch 3.5mm, size 39.5x8.3mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00287_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_4Ucon THT Terminal Block WAGO 236-105 45Degree pitch 5mm size 20x9.8mm^2 drill 1.3mm pad 2.6mm Terminal Block 4Ucon ItemNo. 10700, vertical (cable from top), 3 pins, pitch 5mm, size 25x8.3mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00074, 9 pins, pitch 5mm, size 35x9mm^2.

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