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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 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 either internal or external clock signal, start/stop, manual step button in Unseen Servant 1 year 1 day Digital Reverberation Unit, http://www.belton.co.kr/inc/downfile.php?seq=17&file=pdf (footprint from http://www.uk-electronic.de/PDF/BTDR-1.pdf Bulgin Battery Holder, Keystone, Plastic Case, http://www.keyelco.com/product-pdf.cfm?p=1031 AAA battery holder with leaf spring, Keystone, https://ken.keyeuro.eu/cat/590.pdf AA battery holder Keystone 2xAAA cell battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder 2479 Battery Type 3xAAA (Script generated with kicad-footprint-generator ipc_noLead_generator.py Texas QFN, 24 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_24_7.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 5 times 0.127 mm² wires, reinforced insulation, conductor diameter 2.4mm, outer diameter 1.5mm, size source Multi-Contact FLEXI-E 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 2.5 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E 0.1 (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_noLead_generator.py QFN, 48 Pin (http://www.ti.com/lit/ds/symlink/msp430f5232.pdf#page=111), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-145-02-xxx-DV-A, 45 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator Harting har-flexicon horizontal Harting har-flexicon series connector, B6P-VH-FB-B, shrouded (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, old mpn/engineering number: 5569-10A2, example.

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