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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 bornier4 simple 5-pin terminal block, pitch 5.08mm, hole diameter 0.5mm test point plated hole Plated Hole as test point, pitch 7.62mm, hole diameter 0.5mm test point THT pad as test point, pitch 5.08mm, size 25.4x10.6mm^2, drill diamater 1.3mm, pad diameter 2.4mm, see , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT single screw terminal block RND 205-00048 pitch 5mm size 10x10.5mm^2 drill 1.4mm pad 2.8mm terminal block RND 205-00080 pitch 10mm size 25x8.1mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00232, 2 pins, pitch 3.81mm, size 11.3x7.3mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00287_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-416 45Degree pitch 5mm Varistor, diameter 21.5mm, width 6.7mm, pitch 7.5mm Varistor, diameter 21.5mm, width 7.1mm, pitch 10mm Varistor, diameter 9mm, width 4.2mm, pitch 7.5mm size 9.8x14mm^2 drill 1.15mm pad 3mm Terminal Block WAGO 236-507, 45Degree (cable under 45degree), 5 pins, pitch 5.08mm, size.

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