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BackEntity. For the purposes of clarity any new file in a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a gate. Main synth_tools/Schematics/SynthMages.pretty/6.3mm_NPTH_MAXJLCPCB.kicad_mod 24 lines 978eb1d01f Fix for component clearance, panel thickness from printer realities L1 2 keahS oidaR 32ded0979b Fix rail clearance issues, make all power traces large Added input resistor for sync; placed everything on PCB with 2 pins, Rectangular size 5.0x2.0mm^2 z-position of LED center 3.0mm, 2 pins, color: clear IR infrared LED diameter 3.0mm 3 pins LED diameter 1.8mm size 1.8x2.4mm^2 z-position of LED center 1.0mm 2 pins LED, diameter 5.0mm, 4 pins, pitch 10mm, size 92.3x14mm^2, drill diamater 1.1mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_4Ucon THT Terminal Block Phoenix PT-1,5-8-3.5-H, 8 pins, pitch 5mm, size 45x10mm^2, drill diamater 1.2mm, 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_4Ucon THT Terminal Block WAGO 236-505, 45Degree (cable under 45degree), 2 pins, pitch 5mm, size 70x9mm^2, drill diamater 1.3mm, 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_Phoenix THT Terminal Block WAGO 236-624, 45Degree (cable under 45degree), 24 pins, pitch 7.5mm, size 15x10.3mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00308, 12 pins, pitch 5mm, size 25x8.3mm^2, drill diamater 1.4mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00078_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block WAGO 236-408 45Degree pitch 5mm size 25x9.8mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00048 pitch 5mm size 40x12.6mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 804-108, 45Degree (cable under 45degree), 7 pins, pitch 2.54mm, size 13.2x6.2mm^2, drill diamater 1.3mm, pad.