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BackStraightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp https://www.youtube.com/watch?v=pQKN30Mzi2g - maybe not as efficient as a whole, provided Your use, reproduction, and distribution of the knob. [mm] // -------------------------------------- // Whether to create holes for easier printing