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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 supporting components. ~$6 in parts, two tl074 op amps and otherwise a bunch of wires backwards e6b834b08c Fix floating pin for op amp 54f1a61ba5 gets jiggy with PCB locator, 5 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator ipc_noLead_generator.py DHVQFN, 20 Pin (https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 2 times 0.75 mm² wires, reinforced insulation, conductor diameter 0.4mm, outer diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 804-109, 45Degree (cable under 45degree), 3 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-3VSURKCGKC(Ver.8A).pdf LED diameter 3.0mm z-position of LED center 1.0mm 2 pins Rectangular size 3.9x1.8mm^2 2 pins LED diameter 3.0mm z-position of LED center 2.0mm, 2 pins, diameter 8.0mm, 2 pins, pitch 5mm, size 60x9mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00298_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 804-302, 45Degree (cable under 45degree), 5 pins, pitch 7.5mm, size 52.5x10.3mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00067_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block Metz Connect 360381, block size 6x4mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.metz-connect.com/ru/system/files/productfiles/Data_sheet_310941_RT035xxHBLU_OFF-022742T.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MPT-0,5-7-2.54 pitch 2.54mm size 25.86x6.5mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00001, 2 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-169XCGDK(Ver.9B).pdf LED_Rectangular Rectangular Rectangular size 3.9x1.9mm^2, 2 pins, color: clear IR infrared LED diameter 1.8mm size 1.8x2.4mm^2 z-position of LED center 1.6mm 2 pins diameter 3.0mm z-position of LED center 3.0mm, 2 pins, pitch 5mm, size 10x9mm^2, drill diamater 1.15mm, pad diameter 1.4mm, outer diameter 3mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST XA series connector, BM09B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-0730, 7 Pins (http://www.molex.com/pdm_docs/sd/559350530_sd.pdf), generated with kicad-footprint-generator Hirose DF13C SMD, CL535-0409-1-51, 9 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD 2220 (5650 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: https://www.vishay.com/docs/20035/dcrcwe3.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-112-02-xxx-DV, 12 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD AVX-U.

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