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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 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 https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm Highspeed card edge connector for 2.4mm PCB's with 20 contacts (not polarized Highspeed card edge connector for PCB's with 60 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 40 contacts (polarized Highspeed card edge card connector socket for 2.36mm PCBs, vertical, alignment pins, weld tabs, board locks (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf 0.8 mm BGA-64, 10x10 raster, 4.618x4.142mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f303r8.pdf WLCSP-49, 7x7 raster, 2.965x2.965mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32l476me.pdf WLCSP-81, 9x9 raster, 4x4mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32l152ze.pdf WLCSP-143, 11x13 raster, 4.539x5.849mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/DM00282249.pdf WLCSP-90, 10x9 raster, 4.223x3.969mm package, pitch 0.4mm; http://www.fujitsu.com/global/documents/products/devices/semiconductor/fram/lineup/MB85RS1MT-DS501-00022-7v0-E.pdf Infineon.

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