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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 modified version of bornier3 simple 4-pin terminal block, pitch 5.0mm, see https://diotec.com/tl_files/diotec/files/pdf/datasheets/b40r.pdf diode bridge 9.8mm WOG pitch 5.08mm length 26mm diameter 10mm Electrolytic Capacitor CP Axial series Axial Horizontal pin pitch 20.32mm 2W length 17mm diameter 6.5mm Electrolytic Capacitor C Radial series Radial pin pitch 5.08mm size 30.5x8.45mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00055, 12 pins, pitch 10mm, size 82.3x14mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00078_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type011_RT05503HBWC pitch 5mm size 51.5x15mm^2 drill 1.2mm pad 2.3mm terminal block Metz Connect 360381 size 5x5mm^2 drill 1.5mm pad 3mm Terminal Block WAGO 236-316 45Degree pitch 5mm size 30x8.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00244, 5 pins, pitch 5mm, size 35x12.6mm^2, drill diamater 1.2mm, pad diameter 3mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py HSOP, 8 Pin (JEDEC MO-153 Var DB https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Molex Pico-Clasp side entry JST SHL series connector, B16B-PUDSS (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 26-60-5170, 17 Pins per row (http://www.molex.com/pdm_docs/sd/1053141208_sd.pdf), generated with kicad-footprint-generator JST PUD series connector, SM03B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Hirose DF11 through hole, DF11-28DP-2DSA, 14 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000994748), generated with kicad-footprint-generator JST GH series connector, BM09B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator Wuerth WR-WTB series connector, BM16B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-0410, with PCB locator, 8 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 Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502426-3010, 30 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 QFN, 24 Pin (https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/44000000MDkO/lWPNMeJClEs8Zvyu7AlDlKSyZqhYdVpQzFLVfUp.EXs), generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 26-60-4080, 8 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 43045-1821 (alternative finishes.

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