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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 the number of pins: 04; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1757271 12A || order number: 1924415 16A (HC Generic Phoenix Contact connector footprint for: GMSTB_2,5/3-GF-7,62; number of pins: 07; pin pitch: 3.81mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1923885 16A (HC Generic Phoenix Contact connector footprint for: MSTB_2,5/12-GF; number of pins: 02; pin pitch: 7.62mm; Vertical || order number: 1757323 12A || order number: 1776605 12A || order number: 1924169 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/10-GF-3.5; number of pins: 13; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1776757 12A || order number: 1806313 12A 630V Generic Phoenix Contact connector footprint for: MSTB_2,5/15-GF-5,08; number of pins: 02; pin pitch: 3.50mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1755736 12A || order number: 1757352 12A Generic Phoenix Contact connector footprint for: MSTB_2,5/15-GF; number of pins: 02; pin pitch: 5.08mm; Vertical || order number: 1828003 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/13-GF-3.81; number of pins: 02; pin pitch: 3.50mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1776977 12A || order number: 1806313 12A 630V Generic Phoenix Contact connector footprint for: MSTBV_2,5/15-GF; number of pins: 03; pin pitch: 5.08mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C.

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