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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 it, under Section 2.1 of this version of bornier6 Terminal Block WAGO 236-148, 45Degree (cable under 45degree), 12 pins, pitch 10mm, size 45x10.3mm^2, drill diamater 1.3mm.

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