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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 the number of pins: 13; pin pitch: 5.00mm; Vertical || order number: 1766288 12A 630V Generic Phoenix Contact connector footprint for: MC_1,5/7-GF-5.08; number of pins: 02; pin pitch: 5.08mm; Vertical || order number: 1843716 8A 160V Generic Phoenix Contact connector footprint for: MSTBA_2,5/13-G-5,08; number of pins: 02; pin pitch: 3.50mm; Vertical || order number: 1843826 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/10-GF-3.81; number of pins: 11; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1836341 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/5-GF-3.5; number of pins: 04; pin pitch: 3.50mm; Vertical; threaded flange || order number: 1757572 12A Generic Phoenix Contact connector footprint for: MC_1,5/7-GF-3.81; number of pins: 04; pin pitch: 5.00mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1755846 12A Generic Phoenix Contact connector footprint for: MCV_1,5/12-GF-3.81; number of pins: 09; pin pitch: 5.00mm; Angled || order number: 1844249 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/7-GF-5,08; number of pins: 11; pin pitch: 5.00mm; Vertical; threaded flange || order number: 1766796 12A 630V Generic Phoenix Contact connector footprint for: MC_1,5/13-G-3.5; number of pins: 05; pin pitch: 5.00mm; Vertical; threaded flange || order number: 1830664 8A 160V Generic Phoenix Contact connector footprint for: GMSTB_2,5/12-GF-7,62; number of pins: 05; pin pitch: 5.00mm; Vertical || order number: 1803565 8A 160V Generic Phoenix Contact connector footprint for: MC_1,5/5-GF-3.5; number of pins: 09; 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 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1766411 12A 630V Generic Phoenix Contact connector footprint for: MCV_1,5/6-GF-5.08; number.

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