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### Current draw 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 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | | | Tayda | A-1157 or A-2425 | | | | | Tayda | A-559 | | | Tayda | A-3588 | | | | Tayda | A-3186 | | | | Tayda | A-2939 | | | | Tayda | A-553 | | | | C12 | 3 | A1M | **Potentiometer, 9 mm or 16 mm vertical board mount module ACDC-Converter, 3W, Hahn-HS-400xx, THT https://www.schukat.com/schukat/schukat_cms_de.nsf/index/FrameView?OpenDocument&art=HS40009&wg=M7942 ACDC-Converter, 3W, HiLink, HLK-PMxx, THT, http://www.hlktech.net/product_detail.php?ProId=54 ACDC-Converter 3W THT HiLink board mount | | | | | | C10 | 1 | LED | Light emitting diode, 5 mm x 0.3 mm x 0.3 mm x 0.3 mm body (https://assets.nexperia.com/documents/package-information/SOD962-2.pdf https://www.nexperia.com/packages/SOD962-2.html Diode SMPA (DO-221BC), https://www.vishay.com/docs/87659/v8pa10.pdf Single phase, Bridge rectifier, 28.614x28.614mm, case KBPC_T(FP), https://www.diodemodule.com/bridge-rectifier/kbpc/kbpc1501t.pdf Single phase, Bridge rectifier, 28.55x28.55mm, case KBPC_W(WP), https://www.diodemodule.com/bridge-rectifier/kbpc/kbpc15005w.pdf 128x32 LCD with RGB backlight https://www.newhavendisplay.com/specs/NHD-C12832A1Z-FSRGB-FBW-3V.pdf EPCOS/TDK Electronics/Qualcomm DCC6c SAW filter package - 1.1x0.9 mm Body; (see https://global.kyocera.com/prdct/electro/product/pdf/sf14_tdlte.pdf 0.5A, 250VAC, 50/60Hz line filter (https://filtercon.com.pl/wp-content/uploads/2019/07/Karta-katalogowa-FP-12-1.pdf Mini-Circuits Filter SMD 1206 (3216 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://datasheets.avx.com/F72-F75.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 2 times 0.127 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 3mm, see , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_4Ucon THT Terminal Block 4Ucon ItemNo. 10686 pitch 3.5mm size 21x6.5mm^2 drill 1.2mm pad 2.4mm Terminal Block WAGO 236-448, 45Degree (cable under 45degree), 6 pins.

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