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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 the CLOCK op-amp from 1 to 4.9 milli Ohm (http://http://www.vishay.com/docs/30108/wsk.pdf Shunt Resistor SMD 2512 (6332 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 ipc_gullwing_generator.py LQFP, 48 Pin (http://ww1.microchip.com/downloads/en/devicedoc/00002117f.pdf#page=69), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-140-02-xx-DV-TE, 40 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series.

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