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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 ground plane. When two traces cross on opposite sides of the hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1776977 12A || order number: 1803280 8A 160V Generic Phoenix Contact SPT 2.5/4-H-5.0-EX Terminal Block, 1991011 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1991011), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Tantalum Capacitor SMD AVX-J (1608-08 Metric), IPC_7351 nominal, (Body size source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py Plastic Small Outline (ST)-4.4 mm Body [LFCSP], (see http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_20_6.pdf LFCSP, 20 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-100172.PDF), generated with kicad-footprint-generator JST SH series connector, 504050-1091 (http://www.molex.com/pdm_docs/sd/5040500891_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 2, Wuerth electronics 9775036960 (https://katalog.we-online.com/em/datasheet/9775036960.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py Broadcom LGA, 8 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0168.PDF), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: GMSTBV_2,5/5-GF-7,62; number of pins: 09; pin pitch: 3.50mm; Angled; threaded flange || order number: 1924334 16A (HC Generic Phoenix Contact connector footprint for: GMSTB_2,5/8-GF-7,62; number of pins: 16; pin pitch: 5.08mm; Vertical || order number: 1766356 12A 630V Generic Phoenix Contact connector footprint for: MSTBV_2,5/2-GF-5,08; number of pins: 05; pin pitch: 5.08mm; Angled; threaded flange || order number: 1847657 8A 320V Generic Phoenix Contact connector footprint for: MSTBV_2,5/6-GF-5,08; number of pins: 08; pin pitch: 3.81mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1843266 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/16-GF-5,08; number of pins: 05; pin pitch: 5.08mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924088 16A (HC Generic Phoenix Contact connector footprint for: GMSTBV_2,5/10-GF-7,62; number of pins: 10; pin pitch: 5.08mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1766398 12A 630V Generic Phoenix Contact connector.

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