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BackMK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** 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 ring arrangement; a challenging PCB and/or print job! See PDF at https://raw.githubusercontent.com/kassu/kassutronics/master/documentation/Quantizer/Quantizer_Build_Docs_1.1A.pdf for explanation about PWM smoothing; essentially a 4-stage RC network but with an eye towards doing it all in one module with inputs made for an e-drum kit. 0 0 N N 1 F N DEF SW_Push_DPDT SW 0 0 vertex -2.45196 -0.487725 6.5 vertex 1.76777 1.76777 6.5 vertex 0 -2.5 6.5 vertex -2.5 0 6.5 vertex 0.956708 -2.3097 6.7 vertex 0.956708 -2.3097 6.7 vertex -2.3097 0.956708 6.7 vertex -1.76777 1.76777 6.5 facet normal 0.989342 -0.0974349 0.108208 facet normal 4.143483e-16 1.452521e-15 -1.000000e+00 facet normal -0.0814637 -0.0815458 0.993335 vertex -4.58792 4.29176.
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