Some users asked why the QuadVol board is not on stock anymore. Unfortunately I don’t have much time to support users of this board, therefore I won’t produce it anymore. However, I release the PCB design files for this project under the Creative Commons Attribution-ShareAlike 4.0 International License. You can download them here: quadvol.zip

QuadVol by Daniel Matuschek is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Based on a work at http://www.crazy-audio.com/projects/quad-volume-control/.