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BackExplainer 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.
- For reference. $33.20/board from pcbshopper Lion.
- Gitignore and git rm --cache b284a71188b23f9f8c43bee1fcce2820249f4384