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Full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file 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 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 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules a840574ffb AD&D 1e MM, DMG, and PHB. # Exported BOM files All-in-one module with integral chip antenna (http://ww1.microchip.com/downloads/en/DeviceDoc/60001380C.pdf Cypress EZ-BLE PRoC Module (Bluetooth Smart) 21 Pin Module Digi XBee SMT RF ESP WROOM-02 espressif esp8266ex 2.4 GHz Wi-Fi and Bluetooth module, https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf 2.4 GHz Wi-Fi and Bluetooth module, https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf NINA-B111 LGA module 42 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/05081875_0_UHE42.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: A-41791-0004 example for new mpn: 39-28-x04x, 2 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py ST HLGA, 10 Pin (http://www.ti.com/lit/ml/mpds579b/mpds579b.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for a single 0.1 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 1mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 0.15 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E_0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST XH series connector, LY20-18P-DLT1, 9 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator JST ZE series connector, BM15B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 32 Pin (https://www.analog.com/media/en/package-pcb-resources/package/3416438741201015623cp_32_4.pdf), generated with kicad-footprint-generator Capacitor SMD AVX-R (7260-38 Metric), IPC_7351 nominal, (Body size source: https://www.vishay.com/docs/20035/dcrcwe3.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-119-02-xxx-DV-BE, 19 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 0.25 mm² wires, reinforced insulation, conductor diameter 0.9mm, outer diameter 3mm, see http://www.produktinfo.conrad.com/datenblaetter/550000-574999/556441-da-01-de-LEITERPLATTENKL__PTSM_0_5__8_2_5_H_THR.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-6-3.5-H, 6 pins, pitch 5mm, size 35x10mm^2, drill diamater 1.15mm, pad diameter 2.1mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Single banana socket, footprint - 2 pin Molex header 2.54 mm spacing | | Tayda .

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