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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 a volume of a Korg MS-20. ** that one fails due to referer checks 943ef1409b Fix getting a bunch of wires backwards Fix floating pin for Pause (J19/J18); the schematic is incorrect Ins: Clock In - diode to U2-3 Glide In - diode.

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