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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 or 2W Single and Dual Output, 1500VDC Isolation, 19.0x17.0x8.7mm https://www.xppower.com/Portals/0/pdfs/SF_ISU02.pdf DCDC SMD XP POWER ISU02 XP_POWER ITQxxxxS-H, SIP, (https://www.xppower.com/pdfs/SF_ITQ.pdf), generated with kicad-footprint-generator Wuerth WR-WTB series connector, B03B-JWPF-SK-R (http://www.jst-mfg.com/product/pdf/eng/eJWPF1.pdf), generated with kicad-footprint-generator JST XA series connector, B6B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Molex Molex 1.00mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact Style, 33 Circuits (http://www.molex.com/pdm_docs/sd/5022503391_sd.pdf), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-20DS-0.5V, 20 Pins (http://www.molex.com/pdm_docs/sd/555600207_sd.pdf), generated with kicad-footprint-generator Fuse SMD 2920 (7451 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Molex Picoflex side entry JST VH series connector, 14110913002xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13002XXX_100228421DRW035C.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through.

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