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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 4.5mm, height 1, Wuerth electronics 9774025243 (https://katalog.we-online.de/em/datasheet/9774025243.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 4 times 1.5 mm² wires, reinforced insulation, conductor diameter 1.4mm, outer diameter 3mm, see , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix MPT-0,5-4-2.54 pitch 2.54mm size 25.86x6.5mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00084, vertical (cable from top), 3 pins, pitch 2.54mm, size 23.3x6.2mm^2, drill diamater 1.4mm, pad diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00045_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-8-5.0-H, 8 pins, pitch 10.2mm, size 96.5x8.3mm^2, drill diamater 1.15mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00276_DB_EN.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00080, vertical (cable from top), 8 pins, pitch 3.5mm, size 17.5x7.6mm^2, drill diamater 1.3mm, pad diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00045_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00051, 8 pins, pitch 3.5mm, size 49.7x7mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_311751_RT027xxHBLC_OFF-022814U.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-212, 45Degree (cable under 45degree), 5 pins, pitch 5mm, size 15x9.8mm^2, drill diamater 1.15mm, pad diameter 3mm, see , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type094_RT03504HBLU pitch 5mm Varistor, diameter 15.5mm, width 6.3mm, pitch 7.5mm size 182x14mm^2 drill 1.15mm pad 3mm Terminal Block Phoenix MKDS-3-16-5.08, 16 pins, pitch 7.5mm, size 14x15mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_317011_RT11LxxHGLU_OFF-022798U.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00293 pitch 5.08mm length 4mm diameter 2mm Diode, DO-35_SOD27 series, Axial, Horizontal, pin pitch=5.08mm, 4W, length*width*height=20*6.4*6.4mm^3, http://cdn-reichelt.de/documents/datenblatt/B400/5WAXIAL_9WAXIAL_11WAXIAL_17WAXIAL%23YAG.pdf Resistor Axial_Power series Box pin pitch 7.50mm diameter 10mm Fastron 77A Inductor, Axial series, Axial, Horizontal, pin pitch=43mm, , length*diameter=37*13mm^2, Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Horizontal pin pitch 75mm length 67mm diameter 29.0mm Electrolytic Capacitor C, Rect series, Radial, pin pitch=5.00mm, , diameter=5.0mm, Tantal Electrolytic Capacitor, , http://www.kemet.com/Lists/ProductCatalog/Attachments/424/KEM_AC102.pdf CP.

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