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An op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else use a modified version of bornier5 simple 6pin terminal block, pitch 5.0mm, 45 degree angled, see http://www.mouser.com/ds/2/16/PCBMETRC-24178.pdf Altech AK300 terminal block, pitch 5.08mm, size 10.2x9.8mm^2, drill diamater 1.3mm, 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_WAGO THT Terminal Block WAGO 804-112, 45Degree (cable under 45degree), 15 pins, pitch 5.08mm, size 10.2x8.45mm^2, drill diamater 1.3mm, pad diameter 2.4mm, outer diameter 3.5mm, size source Multi-Contact FLEXI-xV 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 2, Wuerth electronics 9774080482 (https://katalog.we-online.de/em/datasheet/9774080482.pdf), generated with kicad-footprint-generator JST EH vertical.

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