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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 the package registry, see the documentation. Condition "A.Type == 'via'" condition "A.Type == 'via'" condition "A.Type == 'pad' && B.Type == 'graphic')" (condition "A.Type == 'via' && B.Type == 'graphic')" (condition "A.Type == 'via' && B.Type == 'track'" (condition "A.Type == 'pad' && A.Fabrication_Property == 'Castellated.

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