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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 fairly 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 raspberry pi zero through hole M2, height 8, Wuerth electronics 9775096960 (https://katalog.we-online.com/em/datasheet/9775096960.pdf), generated with kicad-footprint-generator JST VH series connector, BM04B-ACHSS-A-GAN-ETF (http://www.jst-mfg.com/product/pdf/eng/eACH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 16-Lead Lead Frame Chip Scale Package - 6x8x0.9mm Body (https://www.microsemi.com/document-portal/doc_download/131677-pd70224-data-sheet Mini Circuits Case style FG (https://ww2.minicircuits.com/case_style/FG873.pdf LQFN, 48 Pin (http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.3.pdf#page=67), generated with kicad-footprint-generator.

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