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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 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 Resistor SMD 0612 (1632 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: https://www.nikhef.nl/pub/departments/mt/projects/detectorR_D/dtddice/ERJ2G.pdf), generated with kicad-footprint-generator JST VH PBT series connector, DF3EA-02P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing&lang=en&documentid=0001163317), generated with kicad-footprint-generator ipc_noLead_generator.py WQFN-20 4.5mm 2.5mm 0.5mm WQFN, 20 Pin (https://www.ti.com/lit/ds/symlink/ts3ds10224.pdf#page=29), generated with kicad-footprint-generator Molex CLIK-Mate series connector, S32B-PUDSS-1 (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator Molex PicoBlade top entry Molex 734 Male header (for PCBs); Angled solder pin 1 x 1 mm, 734-172 , 12 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 5566-24A2, example for new part number: 09-65-2108, 10 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, old mpn/engineering number: 5569-06A2, example for new part number: A-41791-0003 example for new part number: 09-65-2088, 8 Pins per row, Mounting: (http://www.molex.com/pdm_docs/sd/039281043_sd.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 5/4-H-7.5-ZB 1719215 Connector Phoenix Contact SPT 2.5/11-H-5.0 1991066 Connector Phoenix Contact, SPT 2.5/4-H-5.0 1990999 Connector Phoenix Contact, SPT 5/11-H-7.5-ZB 1719286 Connector Phoenix Contact connector footprint for: MSTB_2,5/9-GF-5,08; number of pins: 10; pin pitch: 3.81mm; Angled; threaded flange || order number: 1755545 12A || order number: 1827923 8A 160V Generic Phoenix Contact connector footprint for: MC_1,5/5-G-3.5; number of pins: 12; pin pitch: 3.50mm; Angled || order number: 1766725 12A 630V Generic Phoenix Contact SPT 2.5/8-H-5.0 1991037 Connector Phoenix Contact, SPT 5/2-V-7.5 Terminal Block, 1732467 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732467), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount Common Mode Line Filter API Delevan, Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89005xx, 5 Pins.

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