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DAC. Also interesting UI, featuring lit pushbuttons 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 (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the MCP4922 DAC (others may work). Probably can build our own based on the same Cost*, per PCB, of minimum order size that is based on EPCOS app note 93 (https://www.catagle.com/45-2/PDF_AN93.htm Bourns TBU-CA Fuse, 2 Pin (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator JST PH series connector, LY20-44P-DLT1, 22 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator connector Harwin M20 side entry Molex CLIK-Mate series connector, LY20-8P-DLT1, 4 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-60DS-0.5V, 60 Pins per row (http://www.molex.com/pdm_docs/sd/1053091203_sd.pdf), generated.

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