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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 use a raspberry pi zero through hole 2.25mm, height 4.5, Wuerth electronics 9775086960 (https://katalog.we-online.com/em/datasheet/9775086960.pdf), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: GMSTB_2,5/4-GF-7,62; number of pins: 06; pin pitch: 7.62mm; Angled; threaded flange || order number: 1847615 8A 320V Generic Phoenix Contact connector footprint for: MC_1,5/2-G-5.08; number of pins: 06; pin pitch: 5.00mm; Vertical || order number: 1924622 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/13-G-3.81; number of pins: 07; pin pitch: 5.00mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1806232 12A 630V Generic Phoenix Contact SPT 5/5-H-7.5-ZB Terminal Block, 1732438 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732438), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 2, Wuerth electronics 9774060360 (https://katalog.we-online.de/em/datasheet/9774060360.pdf), generated with kicad-footprint-generator Resistor SMD 0815 (2038 Metric), square.

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