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(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 LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W single output DC/DC Murata MGJ2DxxxxxxSC, 19.5x9.8x12.5mm, 5.2kVDC Isolated, 2W, SIP package style, https://power.murata.com/data/power/ncl/kdc_mej1.pdf muRata MEJ1SxxxxSC, 19.5x9.8x12.5mm, 5.2kVDC Isolated, 2W, SIP package style, https://power.murata.com/data/power/ncl/kdc_mgj2.pdf Murata MGJ3, 5.2kVDC Isolated 3W Gate Drive, 15V/5V/5V Configurable, 22.61x23.11x14.19mm, https://power.murata.com/datasheet?/data/power/ncl/kdc_mgj3.pdf Murata NCS1SxxxxSC https://power.murata.com/data/power/ncl/kdc_ncs1.pdf Isolated 1W or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78B-2.0, SIP-3, pitch 2.54mm, size 18.240000000000002x6.5mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00009, 10 pins, pitch 5mm, size 42.3x14mm^2, drill diamater 1.15mm, pad diameter 2.4mm, outer diameter 3.6mm, size source Multi-Contact FLEXI-2V 0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius.

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