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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 (sw13 // 1 to 4.9 milli Ohm (http://http://www.vishay.com/docs/30108/wsk.pdf Power Metal Strip Resistors 0.005 to 0.2, https://www.vishay.com/docs/30101/wsr.pdf 4-pin Resistor SIP pack 9-pin Resistor SIP pack 9-pin Resistor SIP pack 9-pin Resistor SIP pack 10-pin Resistor SIP pack 7-pin Resistor SIP pack 13-pin Resistor SIP pack 11-pin Resistor SIP pack 10-pin Resistor SIP pack 10-pin Resistor SIP pack 6-pin Resistor SIP pack 9-pin Resistor SIP pack 13-pin Resistor SIP pack 11-pin Resistor SIP pack 9-pin Resistor SIP pack 8-pin Resistor SIP pack 13-pin Resistor SIP pack 7-pin Resistor SIP pack 11-pin Resistor SIP pack 11-pin Resistor SIP pack 13-pin Resistor SIP pack 7-pin Resistor SIP pack 11-pin Resistor SIP pack 10-pin Resistor SIP pack 5-pin Resistor SIP pack 5-pin Resistor SIP pack 10-pin Resistor SIP pack 9-pin Resistor SIP pack Resistor, Axial_DIN0204 series, Axial, Horizontal, pin pitch=85mm, , length*diameter=80*26mm^2, Electrolytic.

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