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Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a ground plane created pull request 'Finish schematic, add PDF | J6 | 1 | SW_SPDT | SPDT miniature toggle switch ON-ON Push button switch | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-3186.

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