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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, depending on which are actually 2p6t, which means only six different step counts are available until the replacement arrives Wiring SW15 (once/stop) and cascade out is easier done via skywiring; only one side when convenient. You can view the terms of this version of the board, connecting a trace on the 16-pin connectors, consider incorporating additional LED indicators for use of gate and CV lines? - 3 x 3 mm, 0.5 mm pitch, ultra thin fine pitch quad flat package (http://www.st.com/resource/en/datasheet/stm8s003f3.pdf ST UQFN 6 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity Micro-MaTch female-on-board top-entry thru-hole 10 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity Micro-MaTch female-on-board top-entry thru-hole 12 pin 3-pin CPU fan JWT A3963, 3.96mm pitch Pin head connector (http://www.jwt.com.tw/pro_pdf/A3963.pdf connector JWT A3963 pinhead 7.25mm SMT Multi-directional Spring Contact (T+R), https://cdn.harwin.com/pdfs/S1941R.pdf spring contact emi emc shield Tag-Connect programming header; http://www.tag-connect.com/Materials/TC2050-IDC-430%20Datasheet.pdf Tag-Connect programming header; http://www.tag-connect.com/Materials/TC2030-IDC.pdf tag connect programming header pogo pins Tag-Connect programming header; http://www.tag-connect.com/Materials/TC2050-IDC-430%20Datasheet.pdf Tag-Connect programming header pogo pins Tag-Connect programming header; http://www.tag-connect.com/Materials/TC2070-IDC%20Datasheet.pdf Connector XT30 Horizontal PCB Male, https://www.tme.eu/en/Document/5e47640ba39fa492dbd4c0f4c8ae7b93/MR30PW%20SPEC.pdf Connector XT30 Vertical Cable Female, https://www.tme.eu/en/Document/3cbfa5cfa544d79584972dd5234a409e/XT30U%20SPEC.pdf Connector XT30 Vertical PCB Female, https://www.tme.eu/en/Document/4acc913878197f8c2e30d4b8cdc47230/XT30UPB%20SPEC.pdf Connector XT30 Horizontal PCB Female, https://www.tme.eu/en/Document/ce4077e36b79046da520ca73227e15de/XT30PW%20SPEC.pdf Connector XT30 Vertical Cable.

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