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MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, 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 Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 | | | | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35 Pin header 2.54 mm spacing KK254 Molex header Switch, triple pole double throw, separate symbols 2x5 pin shrouded header 2.54 mm spacing 2 pin Molex connector 2.54 mm spacing D 2 pin Molex connector KK254 Molex connector 2.54 mm spacing D 3 rotary switches are actually 8.8mm but require more on the thru-holes. C7 is a ceramic 104 power cap like C5, C6, C8, C9, C11, C12. C10, C14 is a little bit of margin $fn=FN; /* [Panel] */ wall(h=10, w=height-hole_dist_top*2-32); // decoration? Surface("FireballSpellSmall.png", center=true, invert=false); More experimentation with panel alignment before printing Add notes about wiring SW15 cross-board facet normal -0.757656 0.64885 -0.0703637 vertex -0.663325 -10.0728 0.0491304 vertex -0.579809 -9.97626 0.0401256 facet normal 0.956969 0.290189 -5.37408e-06 facet normal -0.0818475 0.0808324 0.993362 vertex -5.1829 -4.10478 7.85113 facet normal -0.767816 -0.634378 0.0895789 facet normal -0.187658 -0.0572764 0.980563 facet normal 9.468859e-01 3.215698e-01 -2.758115e-10 vertex -9.055258e+01 1.011513e+02 1.090221e+01 facet normal 4.720713e-001 -8.093082e-001 3.495267e-001 vertex -3.443231e+000 2.638496e+000 2.480400e+001 facet normal -0.80732 0.0635162 0.586685 facet normal -4.434096e-01 -0.000000e+00 -8.963191e-01 vertex -1.048734e+02 9.725134e+01 1.245949e+01 facet normal 0.95132 0.288584 0.108209 vertex -1.13596 5.71086 21.335 facet normal -0.273132 0.564081 0.779238 facet normal -0.195077 -0.980788 0 facet normal 0.839833 0.533683 0.0993123 facet normal 0.0127267 0.705404 0.708692 facet normal -0.451284 0.844291 0.288991 facet normal -2.889970e-06 -1.000000e+00 -4.638985e-07 vertex -1.042698e+02 9.665134e+01 1.132288e+01 facet normal -4.391161e-002 7.528103e-002 9.961950e-001 facet normal 0.0823699 -0.081813 0.993238 vertex 0 -6.2584 7.81508 facet normal -0.115803 -0.000209061 0.993272 facet normal -0.995186 0.0973393 0.0113559 vertex -5.71699 -1.07374 21.335.

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