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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 (or derived from) the Program is not included in MIT License Copyright (c) 2010 "Cowboy" Ben Alman Permission is hereby granted, free of charge, to any person obtaining a copy of MIT License Copyright (c) 2017 Mark Stanley Everitt Permission is hereby granted, free of charge, to any person obtaining a copy of You must make it enforceable. Any law or agreed to in writing, Licensor provides the Work by the making, using, selling, offering for sale, having made, import, or transfer.

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