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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 the CLOCK op-amp from 1 to 4.9 milli Ohm (http://http://www.vishay.com/docs/30108/wsk.pdf Shunt Resistor SMD 0402 (1005 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WQFN, 24 Pin (https://ww1.microchip.com/downloads/aemDocuments/documents/product-documents/package-drawings/24L-VQFN%E2%80%934x4x0.9mm-MJ-C04-00143b.pdf), generated with kicad-footprint-generator JST XA series connector, B12B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 5267-15A, 15 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator JST SUR series connector, S11B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST XA series connector, BM15B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Soldered wire connection, for 6 times 0.5 mm² wires, basic insulation, conductor diameter 2mm, see http://www.produktinfo.conrad.com/datenblaetter/550000-574999/556444-da-01-de-LEITERPLATTENKL__PTSM_0_5__4_2_5_V_THR.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-1,5-4-5.08, 4 pins, pitch 5.08mm, size 71.1x9.8mm^2.

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