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Schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF ~$8 in parts, mostly down to PCB edge 4.9399999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 9-pin D-Sub connector horizontal angled 90deg THT female pitch 2.29x1.98mm pin-PCB-offset 3.0300000000000002mm mounting-holes-distance 33.3mm mounting-hole-offset 33.3mm 15-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 9.9mm, distance of mounting holes 47.1mm, distance of mounting holes 25mm, distance of mounting holes to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector straight vertical THT male pitch 2.77x2.84mm mounting holes to PCB edge 11.32mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector horizontal angled 90deg THT female pitch 2.29x2.54mm pin-PCB-offset 9.4mm 9-pin D-Sub connector edge mount solder cup female x-pin-pitch 2.77mm mounting holes 63.5mm, distance of mounting holes to PCB edge 8.2mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector horizontal angled 90deg THT female pitch 2.29x2.54mm pin-PCB-offset 9.4mm 37-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 14.56mm, distance of mounting holes distance 63.5mm Hirose FH12, FFC/FPC connector, FH41-30S-0.5SH, 30 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator Fuse SMD 0805 (2012 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Diode SMD 2512 (6332 Metric), 2.6mm thick, Vishay WKS2512, Terminal length (T) 2.66mm, 0.5 to 0.99 milli Ohm (http://http://www.vishay.com/docs/30108/wsk.pdf Shunt Resistor SMD 4020 (10251 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Capacitor SMD 1206 https://ww2.minicircuits.com/case_style/FV1206-4.pdf Mini-Circuits Filter SMD 1206 https://ww2.minicircuits.com/case_style/FV1206-1.pdf Mini-Circuits Filter SMD 1206 (3216 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 52 Pin (JEDEC MO-153 Var FF https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 24 Pin (https://ww1.microchip.com/downloads/aemDocuments/documents/product-documents/package-drawings/24L-VQFN%E2%80%934x4x0.9mm-MJ-C04-00143b.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-107-02-xxx-DV-BE, 7 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-144-02-xx-DV-TE, 44 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 09-65-2118, 11 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-115-02-xx-DV-TE, 15 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000992393), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 5569-04A1, example for new part number: 26-60-5160.

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