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For 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 raspberry pi zero through hole PLCC, 68 pins, surface mount SMD package TO-269AA (e.g. Diode bridge), see https://diotec.com/tl_files/diotec/files/pdf/datasheets/mys40.pdf Diotec MicroDil diode bridge SMD diode bridge 8.9mm 8.85mm WOB pitch 5.0mm Wuerth WR-TBL Series 3114 terminal block Metz Connect Type059_RT06305HBWC pitch 3.5mm size 7x6.5mm^2 drill 1.2mm pad 2.4mm Terminal Block Phoenix MKDS-1,5-12-5.08, 12 pins, pitch 10mm, size 122x14mm^2, drill diamater 1.2mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00307, 11 pins, pitch 5mm, size 16.5x15mm^2, drill diamater 1.2mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00297 pitch 5.08mm size 45.7x8.45mm^2 drill 1.1mm pad 2.2mm Terminal Block WAGO 804-115, 45Degree (cable under 45degree), 8 pins, pitch 5mm, size 60x8.1mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00001_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-3-2-5.08 pitch 5.08mm size 61x10.6mm^2 drill 1.3mm pad 2.6mm Terminal Block Phoenix MKDS-1,5-14 pitch 5mm size 15x8mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-104, 45Degree (cable under 45degree), 48 pins, pitch 5mm, size 27.3x14mm^2, drill diamater 1.1mm, pad diameter 2.5mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_311011_RT016xxHBWC_OFF-022771S.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-10-5.0-H pitch 5mm size 30x8.3mm^2 drill.

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