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With LED, generic K switch SPST right angle, PTS645VL31-2 LFS C&K Button tactile switch with LED, generic K switch normally-open pushbutton push-button Side push button (https://www.alps.com/prod/info/E/PDF/Tact/SurfaceMount/SKRT/SKRT.pdf push horizontal SPST 1P1T CK components KSC7 tactile switch http://www.ckswitches.com/media/1479/kmr2.pdf CK components KMR2 tactile switch SPST angled PTS645VL31-2 LFS tactile switch Wurth Wuerth Ultraminiature Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7810245, 2 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with StandardBox.py) (Murata NCS1SxxxxSC https://power.murata.com/data/power/ncl/kdc_ncs1.pdf Isolated 1W DCDC-Converter, http://power.murata.com/data/power/ncl/kdc_nma.pdf Murata NMAxxxxSC footprint based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ 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 ~$8 in parts, needing only one tl074 and support Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Latest commits for file.