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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 70 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 70 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 05 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 30 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 40 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 40 contacts (polarized 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 Highspeed card edge connector for PCB's with 08 contacts (polarized Highspeed card edge connector for PCB's with 05 contacts (polarized Highspeed card edge connector for PCB's with 40 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 connector for PCB's with 70 contacts (polarized Highspeed card edge connector for panel, 90° PCB mount 4 pin straight chassis connector http://www.te.com/usa-en/product-1-1478204-0.html BNC female PCB mount 4 pin, 1.0mm round THT pads Net tie, 4 pin, 1.0mm round THT pads Net tie, 3 pin, 1.0mm round THT pads Net tie, 2 pin, 0.5mm square SMD pads Net tie, 3 pin, 1.0mm round THT pads Laser Gaming Sensor ADNS-9800 Fiberoptic Transmitter TX, HFBR series (https://docs.broadcom.com/docs/AV02-3283EN Fiberoptic Receiver RX, HFBR series (https://docs.broadcom.com/docs/AV02-3283EN TSL2550 ambient light sensor, i2c interface, 6-pin chipled package, https://docs.broadcom.com/docs/AV02-2315EN ambient light sensor chipled Broadcom DFN, 6 Pin (https://www.onsemi.com/pdf/datasheet/ncp349-d.pdf#page=12), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 502585-0470 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator Capacitor SMD Kemet-B (3528-21 Metric), IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, DF52-11S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 0.5 mm² wires, basic insulation, conductor diameter 0.4mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-E 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 6.6, Wuerth electronics 9774080943 (https://katalog.we-online.de/em/datasheet/9774080943.pdf), generated with kicad-footprint-generator connector.

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