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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 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a full threaded nose and straight PCB pins, https://www.neutrik.com/en/product/nmj4hfd2 M Series, 6.35mm (1/4in) mono jack, switched, gold plated contacts, efficient chassis ground connection, T+R+S normalling contact, https://www.neutrik.com/en/product/nrj6hm-1-pre Slim Jacks, 6.35mm (1/4in) stereo jack, horizontal PCB mount, replaces NL8MD-V-1, https://www.neutrik.com/en/product/nl8mdxx-v-3 speakON Chassis Connectors, 4 pole chassis connector, nickel metal square G-size flange, self tapping screw holes (A-screw), vertical PCB mount, https://www.neutrik.com/en/product/nc3maah-1 AA Series, 3 pole female XLR receptacle, grounding: ground contact connected to EP (http://www.aosmd.com/res/packaging_information/DFN5x6_8L_EP1_P.pdf 56-Lead Plastic Quad Flatpack (PF) - 14x14mm body, 9.5mm sq thermal pad (http://www.analog.com/media/en/technical-documentation/data-sheets/AD9852.pdf 80-Lead Plastic Thin Quad Flat, No Lead Package (MF) - 3x3x0.9 mm Body [DFN] (http://www.onsemi.com/pub/Collateral/NCP4308-D.PDF DD Package; 14-Lead Plastic DFN, 4mm x 3mm MLF - 3x3x0.85 mm Body [TQFP] With 4.5x4.5 mm Exposed Pad (see Microchip Packaging Specification 00000049BS.pdf 20-Lead Plastic Thin Quad Flatpack (PT) - 10x10x1.0 mm Body [QFN]; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f301r8.pdf WLCSP-49, 7x7 raster, 2.999x3.185mm package, pitch 0.8mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32f446ze.pdf UFBGA-144, 12x12 raster, 10x10mm package, 0.5mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=266, NSMD pad definition Appendix A BGA 1760 1 FF1761 FFG1761 Virtex-7 BGA, 44x44 grid, 45x45mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=289, NSMD pad definition Appendix A BGA 484 0.8 SBG485 SBV485 LFCSP, exposed pad, 7x7mm body (http://www.analog.com/media/en/technical-documentation/data-sheets/AD7951.pdf, http://www.analog.com/en/design-center/packaging-quality-symbols-footprints/symbols-and-footprints/AD7951.html LFCSP-WD, 8 Pin (http://www.ti.com/lit/ds/symlink/tps62823.pdf#page=29), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-124-02-xxx-DV, 24 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_gullwing_generator.py MSOP, 12 Pin (http://www.ti.com/lit/ds/symlink/ldc1312.pdf#page=62), generated with kicad-footprint-generator Molex Pico-Clasp series connector, S13B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Soldered wire connection, for 3 times outer diameter, generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 5566-18A, example for new part number: 26-60-5090, 9 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Hirose DF12E SMD, DF12E3.0-14DP-0.5V, 14 Pins per.

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