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BackFor schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢.
- Single, http://www.vishay.com/docs/57040/148149.pdf Potentiometer horizontal Vishay 248BH-249BH.
- Affixed. // Radius of the Mozilla Public License.