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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 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 05 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 70 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 05 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 20 contacts (polarized Highspeed card edge connector for PCB's with 08 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 30 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 50 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 60 contacts (not polarized Highspeed card edge card connector socket for 1.57mm PCBs, vertical (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf 0.8 mm Highspeed card edge card connector socket for 1.57mm PCBs, vertical, alignment pins (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf 0.8 mm BGA-64, 10x10 raster, 4.775x5.041mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f301r8.pdf WLCSP-49, 7x7 raster, 3.029x3.029mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f303r8.pdf WLCSP-49, 7x7 raster, 3x3mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00284211.pdf WLCSP-104, 9x12 raster, 4.095x5.094mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00340475.pdf WLCSP-66, 9x9 raster, 4.4084x3.7594mm package, pitch 0.65mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f746zg.pdf TFBGA-265, 17x17 raster, 14x14mm package, pitch 0.4mm; see section 6.1 of http://www.st.com/resource/en/datasheet/stm32f405og.pdf WLCSP-100, 10x10 raster, 4.201x4.663mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f051t8.pdf UFBGA-100, 12x12 raster, 10x10mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UCBGA-81, 9x9 raster, 4.039x3.951mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f469ni.pdf WLCSP-180, 13x14 raster, 5.537x6.095mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32f207vg.pdf VFBGA-49, 7x7, 5x5mm package, pitch.

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