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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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.silabs.com/documents/public/data-sheets/si512-13.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSOP, 8 Pin (http://ww1.microchip.com/downloads/en/devicedoc/20005514a.pdf#page=35), generated with kicad-footprint-generator Molex Panelmate series connector, S18B-PUDSS-1 (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: A-41792-0013 example for new mpn: 39-28-x24x, 12 Pins per row (http://www.molex.com/pdm_docs/sd/431602102_sd.pdf), generated with kicad-footprint-generator ipc_plcc_jLead_generator.py PLCC, 44 pins, single row style2 pin1 right Through hole socket strip THT 2x04 1.00mm double row surface-mounted straight socket strip, 2x38, 1.27mm pitch, double cols (from Kicad 4.0.7), script generated Through hole IDC header, 2x17, 2.54mm pitch, double cols (from Kicad 4.0.7), script generated Surface mounted pin header THT 2x35 1.00mm double row Through hole angled pin header SMD 1x32 1.27mm single row Through hole Samtec HPM power.

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