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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 footprint. Some options: Bourns PTL series, such as: Update README.md README.md | 4 | 100k | Resistor | | | | J1 | 1 | 1 | 1 | Synth_power_2x5 .

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