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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 VCF MK's Diode Ladder VCF ~$8 in parts, depending on PCB with on-board Fireball/Fireball.kicad_pcb | 2 pin 0.6x1mm 0.375mm height package, https://www.ti.com/lit/ml/mpss034c/mpss034c.pdf, https://www.ti.com/lit/ds/symlink/tpd6e05u06.pdf USON, 14 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0137.PDF (T1433-2C)), generated with kicad-footprint-generator ipc_noLead_generator.py 20-Pin Plastic Quad Flat, No Lead Package (8E) - 4x4x0.9 mm Body [LFCSP]; (see https://www.intersil.com/content/dam/Intersil/documents/l72_/l72.10x10c.pdf LFCSP VQ, 24 pin, exposed pad: 4.5x8.1mm, with thermal vias; see figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic Thin Quad Flatpack (PH) - 16x16x1 mm Body, 2.00 mm [TQFP] (see Microchip Packaging Specification 00000049BS.pdf DFN, 6 Pin (http://www.nve.com/Downloads/ab3.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, S10B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 4, Wuerth electronics 9774025943 (https://katalog.we-online.de/em/datasheet/9774025943.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 28 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0140.PDF (T1655-4)), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 0.15 mm² wires, reinforced insulation, conductor diameter 1.4mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310861_RT034xxHBLC_OFF-026114K.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-148 45Degree pitch 5mm size 45x9mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00063, 45Degree (cable under 45degree), 12 pins, pitch 5mm, size 30x12.6mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block Metz Connect Type171_RT13706HBWC, 6 pins, pitch 3.5mm, size 52.5x7.6mm^2, drill diamater 1.2mm, pad diameter 3mm, see http://www.metz-connect.com/de/system/files/METZ_CONNECT_U_Contact_Katalog_Anschlusssysteme_fuer_Leiterplatten_DE_31_07_2017_OFF_024803.pdf?language=en page 133, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block TE 282834-3, 3 pins, pitch.

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