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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 use a nut behind the front Don't put R8 so close to R26 D36/R47 too close - Clock rate (B100k) (not sure yet which 2 pins THT ceramic resonator filter DSS6 SMD Resomator/Filter 7.2x3.0mm, Murata CSTCC8M00G53-R0; 8MHz resonator, SMD, Farnell (Element 14) #1170435, http://www.farnell.com/datasheets/19296.pdf?_ga=1.247244932.122297557.1475167906, hand-soldering, 7.2x3.0mm^2 package SMD SMT SPST EVQP2 Light Touch Switch,https://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE20.pdf 0 Light Touch Switch, https://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE28.pdf Light Touch Switch 0 4 2 Button_Switch_SMD SW_SPST_EVQP2 Light Touch Switch,https://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE20.pdf 0 Light Touch Switch, https://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE7.pdf 0 Tactile switch, SPST, 6.0x3.5 mm, H2.5 mm, straight, NO, gull wing leads: https://www.ckswitches.com/media/2779/pts636.pdf switch tactile SPST 1P1T straight NO SMTR C&K E-Switch sub miniature slide switch, OS series, SPDT, https://www.e-switch.com/wp-content/uploads/2022/06/EG.pdf tactile switch, 7.3mm x 6.25mm package, pitch 0.35mm; https://datasheets.maximintegrated.com/en/ds/MAX40200.pdf WLP-9, 1.448x1.468mm, 9 Ball, 3x3 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32l562ce.pdf ST WLCSP-90, ST die ID 471, 4.437x4.456mm, 100 Ball, 10x10 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g491re.pdf ST WLCSP-81, ST die ID 482, 4.2x3.95mm, 90 Ball, X-staggered 18x10 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g051f8.pdf#page=102 ST WLCSP-25, ST die ID 480, 4.57x4.37mm, 132 Ball, 12x11 Layout, 0.35mm Pitch, https://www.onsemi.com/pdf/datasheet/ncp163-d.pdf#page=23 6pin Pitch 0.4mm http://www.chip.tomsk.ru/chip/chipdoc.nsf/Package/C67E729A4D6C883A4725793E004C8739!OpenDocument WSON-16 3.3 x 1.35mm Pitch 0.4mm 8-Lead Plastic DFN (1.3mm x 1.2mm DFN, 8 Pin (https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME680-DS001-00.pdf#page=44), generated with kicad-footprint-generator JST J2100 series connector, B4B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Molex Pico-Clasp series connector, SM13B-ZESS-TB (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LGA, 14 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0137.PDF (T1433-2C)), generated with kicad-footprint-generator JST PUD series connector, 505405-1370 (http://www.molex.com/pdm_docs/sd/5054050270_sd.pdf), generated with kicad-footprint-generator JST GH series connector, B08B-JWPF-SK-R (http://www.jst-mfg.com/product/pdf/eng/eJWPF1.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-14S-0.5SH, 14 Pins (http://www.molex.com/pdm_docs/sd/559350530_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN, 8 Pin (http://www.ixysic.com/home/pdfs.nsf/www/IX4426-27-28.pdf/$file/IX4426-27-28.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF11-12DP-2DSA, 6 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 Resistor SMD 01005 (0402 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: https://www.nikhef.nl/pub/departments/mt/projects/detectorR_D/dtddice/ERJ2G.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 5569-18A2, example for new part number: A-41792-0012 example for new part number: 22-27-2111, 11 Pins per row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator JST XH series connector, BM01B-ACHSS-A-GAN-ETF (http://www.jst-mfg.com/product/pdf/eng/eACH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN 8 2x2mm, 0.5mm http://www.qorvo.com/products/d/da000896 DFN 0.5 Qorvo 2x2mm DFN package size 32.2x9.1x15mm^3, https://www.recom-power.com/pdf/Innoline/R-5xxxPA_DA.pdf dc-dc recom buck lga-25 pitch 2.29mm Traco TDN 5WI.

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