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Simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a raspberry pi zero through hole 3.3mm, height 2, Wuerth electronics 97730356330 (https://katalog.we-online.com/em/datasheet/97730356330.pdf), generated with kicad-footprint-generator JST PH series connector, S38B-PUDSS-1 (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator JST VH PBT series connector, B12B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py MultiPowerSO-30 3EP 16.0x17.2mm Pitch 1mm ST PowerSSO-24 1EP 7.5x10.3mm Pitch 0.8mm 8-Lead Plastic DFN (5mm x 3mm) (http://pdfserv.maximintegrated.com/land_patterns/90-0063.PDF 14-lead very thin plastic quad flat, 3.0x4.5mm size, 0.65mm pitch (http://ww1.microchip.com/downloads/en/DeviceDoc/14L_VDFN_4_5x3_0mm_JHA_C041198A.pdf DE Package; 14-Lead Plastic DFN, 4mm x 3mm MLF - 3x3x0.85 mm Body [SOIC] (https://docs.broadcom.com/docs/AV02-0169EN SOIC 1.27 SSO, 7 Pin Double Sided Module Texas Instruments DSBGA BGA YZR0009 Texas Instruments, DSBGA, 3.415x3.535x0.625mm, 64 ball 8x8 area grid, YZT, 1.86x1.36mm, 12 Ball, 4x3 Layout, 0.4mm Pitch, https://pdfserv.maximintegrated.com/package_dwgs/21-100489.PDF WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.4mm; see section 6.8 of http://www.st.com/resource/en/datasheet/stm32f746zg.pdf TFBGA-100, 10x10, 9x9mm package, pitch 0.8mm Altera BGA-68 M68 MBGA Altera BGA-153 M153 MBGA Altera BGA-153 M153 MBGA Altera BGA-153 M153 MBGA Altera BGA-153 M153 MBGA Altera VBGA V81 BGA-81 Altera BGA-100 M100 MBGA 121-ball, 0.8mm BGA (based on http://www.latticesemi.com/view_document?document_id=213 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera VBGA V81 BGA-81 Altera BGA-100 M100 MBGA 121-ball, 0.8mm BGA (based on standard DIP-4), row spacing 7.62 mm (300 mils), body size (see http://www.nidec-copal-electronics.com/e/catalog/switch/chs.pdf), SMD SMD 2x-dip-switch SPST , Piano, row spacing 8.89 mm (350 mils), SMDSocket, SmallPads 64-lead though-hole mounted DIP package, row spacing 25.4 mm (1000 mils THT DIP DIL PDIP 2.54mm 11.43mm 450mil SMDSocket LongPads 42-lead though-hole mounted DIP package, row spacing 8.9 mm (350 mils), SMDSocket, LongPads 8-Lead, 300\" Wide, Surface Mount Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, with Boss Ultra-small-sized Tactile Switch with High Contact Reliability, Top-actuated Model, with Ground Terminal, without Boss Ultra-small-sized Tactile Switch for High-Density Packaging with Ground Terminal, with Boss Ultra-small-sized Tactile Switch with High Contact Reliability, Side-actuated Model, with Ground Terminal, without Boss Ultra-small-sized Tactile Switch for High-Density Mounting, 7.3mm height, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf C&K Components SPST SMD PTS645 Series 6mm Tact Switch with High Contact Reliability, Side-actuated Model, with Ground Terminal, with Boss SPST button switch with Signal Lamp, generic K switch.

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