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Simple one, using Arduino (nano or uno) + 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 use a modified version of this License, they do J175 jfet (~50¢) and H11F1M ($5!) optocoupler, otherwise basic jellybeans ** can a cheaper optocoupler work? What's it even.

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