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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 larger board underneath the smaller board. #Kicad 7 # 2-layer, 1oz copper condition "A.Type == 'pad' && (B.Type == 'text' || B.Type == 'graphic')" .

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