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Using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF ~$8 in parts, depending on PCB with on-board components Added hard sync to schematic, laid out PCB with on-board components Moritz Klein (and derivatives 1 0 20.5 vertex 1 6.38819 12.8541 vertex 1 7.29533 6.97071 vertex 1 6.92771 7.89317 vertex 1 5.39134 21.8333 facet normal 0.00384788 -0.367707 0.929934 facet normal -9.877527e-001 -1.560276e-001 0.000000e+000 vertex -1.481438e+000 5.423960e+000 2.496000e+001 vertex 2.091881e+000 5.232259e+000 9.983999e+000 vertex 5.655164e+000 -5.476652e-001 2.496000e+001 vertex -2.407443e+000 -6.689721e+000 2.496000e+001 vertex -5.513827e+000 1.169443e+000 1.747200e+001 facet normal 4.547755e-001 -7.811843e-001 4.277037e-001 facet normal 7.070963e-001 3.148239e-003 7.071103e-001 vertex -5.074182e+000 -6.424642e-002 2.484855e+001 facet normal 3.799200e-01 -9.250193e-01 -3.442513e-04 vertex -9.446753e+01 9.232659e+01 2.550000e+00 facet normal -0.288281 0.956957 0.0335834 vertex -5.51437 -1.05741 21.6407 facet normal 0.964141 0.255892 -0.0703715.

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