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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 ~$8 in parts, mostly down to PCB edge 11.32mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector horizontal angled 90deg THT male pitch 2.29x1.98mm mounting holes 25mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.54mm, pin-PCB-offset 9.4mm, see http://docs-europe.electrocomponents.com/webdocs/1585/0900766b81585df2.pdf 9-pin D-Sub connector, straight/vertical, THT-mount, female, pitch 2.41x1.98mm, pin-PCB-offset 8.35mm, distance of mounting holes to PCB edge 15.979999999999999mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector horizontal with green/orange LEDs https://katalog.we-online.de/pbs/datasheet/7499010121A.pdf LAN-Transformer WE-RJ45LAN 10/100/1000 BaseT, Dual Ethernet Jack (http://katalog.we-online.de/pbs/datasheet/7499151120.pdf RJ45 LAN Transformer 10/100BaseT (https://katalog.we-online.de/pbs/datasheet/74980111211.pdf 36pin mini SAS connector, http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1888174&DocType=Customer+Drawing&DocLang=English Molex LSHM 0.50 mm Razor Beam High-Speed Hermaphroditic Terminal/Socket Strip, LSHM-150-xx.x-x-DV-S, 50 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-107-02-xxx-DV-A, 7 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 Molex Molex 1.00mm Pitch Easy-On BackFlip Type FFC/FPC, 502250-2391, 23 Circuits (https://www.molex.com/pdm_docs/sd/2005280230_sd.pdf), generated with kicad-footprint-generator Hirose DF63 through hole, DF13-12P-1.25DSA, 12 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py LQFP, 100 Pin (JEDEC MO-153 Var FE https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-104-02-xxx-DV, 4 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 5566-10A2, example for new part number: AE-6410-04A example for new mpn: 39-28-x20x, 10 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 Mounting Hardware, inside through hole M2, height 8, Wuerth electronics 9774090951 (https://katalog.we-online.de/em/datasheet/9774090951.pdf), generated with kicad-footprint-generator connector JST XH series connector, B9P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-132-02-xxx-DV-BE-LC, 32 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator Wuerth WR-WTB series connector, SM22B-SHLS-TF (http://www.jst-mfg.com/product/pdf/eng/eSHL.pdf), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-40DS-0.5V, 40 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-110-02-xxx-DV-LC, 10 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 7, Wuerth electronics 9774040943 (https://katalog.we-online.de/em/datasheet/9774040943.pdf), generated with StandardBox.py) (https://product.tdk.com/info/en/catalog/datasheets/inductor_automotive_power_slf12575-h_en.pdf inductor TDK VLP smd VLP8040 Inductor, Taiyo Yuden, MD series, Taiyo-Yuden_MD-5050, 5.0mmx5.0mm Inductor, Taiyo Yuden, MD series, Taiyo-Yuden_MD-3030, 3.0mmx3.0mm Inductor, Wuerth Elektronik, Wuerth_MAPI-2512, 2.5mmx2.0mm Inductor, Wuerth Elektronik, WE-PD4, SMT, Typ XL, https://katalog.we-online.com/pbs/datasheet/744776012.pdf Choke Power Inductor WE-PD2.

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