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Simple one, 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 fairly simple one, 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 Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot552-1_po.pdf 14-Lead Plastic DFN (3mm x 3mm) (http://pdfserv.maximintegrated.com/land_patterns/90-0063.PDF 14-lead very thin plastic quad flat, 3.0x4.5mm size, 0.65mm pitch (http://cache.freescale.com/files/shared/doc/package_info/98ASS23330W.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP, 132 pins, 24mm sq body, 0.635mm pitch (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP 132 Intel 386EX (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP, 132 pins, 24mm sq body, 0.635mm pitch, Intel 386EX (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP, 132 pins, 24mm sq body, 0.635mm pitch (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP 132 Intel 386EX (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP, 132 pins, 24mm sq body, 0.635mm pitch, Intel 386EX PQFP, 144 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator connector JST SUR series connector, B40B-PUDSS (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DE Package; 16-Lead Plastic HTSSOP (4.4x5x1.2mm); Thermal pad with vias; (http://www.ti.com/lit/ds/symlink/drv8800.pdf HTSSOP, 16 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0140.PDF (T2055-5)), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 2 times 0.25 mm² wires, reinforced insulation, conductor diameter 0.9mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-xV 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Resistor SMD 0201 (0603 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Hirose series connector, 505405-1370 (http://www.molex.com/pdm_docs/sd/5054050270_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 0.15 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 2mm, size source Multi-Contact FLEXI-xV 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py MSOP, 10 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/00001725D.pdf (Page 9)), generated with kicad-footprint-generator Mounting Hardware, inside through hole M1.6, height 4.5, Wuerth electronics 9774020360 (https://katalog.we-online.de/em/datasheet/9774020360.pdf), generated with kicad-footprint-generator JST XA series connector, 53261-0871 (http://www.molex.com/pdm_docs/sd/532610271_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-122-02-xxx-DV-A, 22 Pins (http://www.molex.com/pdm_docs/sd/903250004_sd.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-1103, 3 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through.

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