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** https://www.instructables.com/Another-MIDI-to-CV-Box-/ 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.instructables.com/Another-MIDI-to-CV-Box-/ 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 PCB's with 30 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 70 contacts (not polarized Highspeed card edge connector for PCB's with 70 contacts (polarized Highspeed card edge connector for 2.4mm PCB's with 70 contacts (not polarized Highspeed card edge connector for PCB's with 40 contacts (polarized Highspeed card edge connector for panel, 90° PCB mount 4 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 Fiberoptic Receiver RX, 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.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-dfn/05081703_C_DC6.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-LC, 41 Pins per row (http://www.molex.com/pdm_docs/sd/428202214_sd.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 105310-xx08, 4 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator Molex Picoflex Ribbon-Cable.

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