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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 (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S_Wide package, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot505-1_po.pdf TSSOP, 8 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/4320fb.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 2.5 mm² wires, reinforced insulation, conductor diameter 2.4mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block Phoenix MKDS-3-4-5.08 pitch 5.08mm length 16mm diameter 6.3mm height 11mm Non-Polar Electrolytic Capacitor CP, Axial series, Axial, Vertical, pin pitch=7.62mm, , length*width=16.51*11.43mm^2, Pulse, KM-2, http://datasheet.octopart.com/PE-92112KNL-Pulse-datasheet-17853305.pdf L_Toroid Vertical series Radial pin pitch 15.24mm length 12mm diameter 9.5mm C, Axial series, Axial, Vertical, pin pitch=7.62mm, 2W, length*diameter=15.5*5mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf Resistor Axial_DIN0309 series Axial Vertical pin pitch 2.54mm size 15.7x6.5mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00292 pitch 5.08mm length 26mm diameter 11mm width 5.0mm Capacitor C, Rect series, Radial, pin pitch=10.00mm, , length*width=13*8mm^2, Capacitor, http://www.wima.com/EN/WIMA_FKS_3.pdf, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 5.00mm length 7.2mm width 8.5mm Capacitor C, Rect series, Radial, pin pitch=7.50mm, , diameter*width=8*5.0mm^2, Capacitor, http://www.vishay.com/docs/28535/vy2series.pdf C Disc series Radial pin pitch 7.50mm length 9mm width 2.7mm Capacitor C, Rect series, Radial, pin pitch=6.35*6.35mm^2, , length*width=9.14*9.14mm^2, Pulse, LP-25, http://datasheet.octopart.com/PE-54044NL-Pulse-datasheet-5313493.pdf Inductor Radial series Radial pin pitch 7.62mm length 26mm diameter 11mm width 5.0mm Capacitor C, Rect series, Radial, pin pitch=7.50mm, , length*width=10*3.0mm^2, Capacitor, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 5.00mm diameter 7.5mm C, Axial series, Axial, Horizontal, pin pitch=15.24mm, , length*diameter=7.6*3.6mm^2, , http://www.diodes.com/_files/packages/DO-15.pdf Diode DO-15 series Axial Vertical pin pitch 10.00mm length 11.5mm width 5.2mm Capacitor C, Disc series, Radial, pin pitch=13.00mm, , diameter=7.7978mm, Diameter9-5mm, Amidon-T30 L_Toroid Horizontal series Radial pin pitch 10.00mm diameter 11mm Fastron 77A Inductor, Axial series, Axial, Vertical, pin pitch=7.62mm, , length*diameter=17.5*12mm^2.

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