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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 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 1.6mm PCB's with 05 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 08 contacts (not polarized Highspeed card edge connector for panel, 90° PCB mount 4 pin straight chassis connector Dual front isolated BNC plug (https://www.winconn.com/wp-content/uploads/364A2595.pdf Dual BNC Horizontal Isolated Subminiature Coaxial Switch 1.35mm High, DC to 11GHz Molex MMCX Horizontal Coaxial Molex MMCX Coaxial Connector 50 ohms Female Würth WR-MMCX PCB SMT Jack, Vertical (https://www.we-online.com/components/products/datasheet/60312102114405.pdf Coaxial Connector 50 ohms Female Jack Vertical THT Amphenol RF 901-143 https://www.amphenolrf.com/library/download/link/link_id/585682 SMA THT Female Jack Vertical SMA THT Female Jack Vertical Bulkhead Molex SMA RF Connector, Edge Mount, (http://www.molex.com/pdm_docs/sd/732511150_sd.pdf Molex SMA RF Connectors, Edge Mount, (http://www.molex.com/pdm_docs/sd/732512120_sd.pdf Connector SMA, 0Hz to 20GHz, 50Ohm, Edge Mount SMB pcb mounting jack Hirose U.FL Coaxial https://www.hirose.com/product/en/products/U.FL/U.FL-R-SMT-1%2810%29/ Molex Microcoaxial RF Connectors (MCRF), mates Hirose U.FL, (http://www.molex.com/pdm_docs/sd/734120110_sd.pdf mcrf hirose ufl u.fl microcoaxial DIN41612 connector, type D, Horizontal, 3 rows 32 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf DIN41612 connector, type R/3, Vertical, 3 rows 32 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf DIN41612 connector, type Q/2, Horizontal, 2 rows 16 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf DIN41612 connector, type Q/3, Vertical, 2 rows 10 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf DIN41612 connector, type B/2, Vertical, 2 rows 10 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf DIN41612 connector, type R/3, Vertical, 3 rows 32 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf.

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