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.ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the number of pins: 12; pin pitch: 5.08mm; Angled; threaded flange || order number: 1923979 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/12-GF-3.5; number of pins: 04; pin pitch: 3.81mm; Vertical; threaded flange || order number: 1776524 12A || order number: 1766673 12A 630V.

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