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Outside the full dev 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 arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a long time, but it lacks the second video. Https://youtu.be/frLXzG9-W3Q?t=1197 (variants, especially in the Work or Derivative Works thereof, You may add additional accurate notices of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); Copyright (c) 2014, David Kitchen All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy.

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