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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 Everything by Hagiwo (quantizer, filters, noisemakers, etc) MIDI-to-CV, either over USB or directly over 5-pin DIN (with optoisolator Deleting the wiki page "Module Spellbook" cannot be undone. Continue? Schematics/Unseen Servant/Unseen Servant.kicad_sch | 175 # Precision ADSR with mods Light emitting diode | | | | | | J7 | 1 | 1 | Synth_power_2x5 | 2x5 pin shrouded header 2.54 mm spacing KK254 Molex header Audio Jack, 2 Poles (Mono / TS)"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x10 | | | | | R4, R6, R7 | 3 | 10k | Resistor | | .

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