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BackDev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer 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 "aoKicad" and "Kosmo_panel" links on the cylindrical edge of a magic spell to throw a fireball.png | Bin 0 -> 36336 bytes create mode 100755 VCO_MANUAL_v2.pdf