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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 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 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/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot158-1_po.pdf VSO56: plastic very small outline package; 40 leads (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot158-1_po.pdf VSO56: plastic very small outline package; 16 leads; body width 3 mm; (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot369-1_po.pdf SSOP, 16 Pin (https://www.st.com/resource/en/datasheet/stp08cp05.pdf#page=20), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 1.5, Wuerth electronics 9774080951 (https://katalog.we-online.de/em/datasheet/9774080951.pdf), generated with kicad-footprint-generator JST XA series connector, B36B-PUDSS (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator Molex Molex 1.00mm Pitch Easy-On Type FFC/FPC Connector, For LVDS, 2.33mm Height, Right Angle, http://www.kycon.com/Pub_Eng_Draw/KDMIX-SL1-NS-WS-B15.pdf HDMI Molex Type A HDMI, Type A, https://gct.co/files/drawings/usb1046.pdf USB SMD USB 2.0 receptacle type B, horizontal version, through-hole, https://downloads.lumberg.com/datenblaetter/en/2411_02.pdf USB B vertical female connector Universal Serial Bus (USB) Shielded I/O Plug, Type C, right-angle, SMT, https://datasheet.lcsc.com/lcsc/2206091745_XKB-Connectivity-U254-051T-4BH83-F1S_C397452.pdf USB Micro-B receptacle, http://www.mouser.com/ds/2/445/629105150521-469306.pdf USB Mini-B 5-pin SMD connector, http://downloads.lumberg.com/datenblaetter/en/2486_01.pdf USB USB_B USB_Mini connector usb mini receptacle vertical Hirose DF13 vertical Hirose DF11 through hole, DF13-07P-1.25DS, 7 Pins per row (http://www.molex.com/pdm_docs/sd/431605304_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 0.75 mm² wires, reinforced insulation, conductor diameter 0.9mm, outer.

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