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Op amp in 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 8.2mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 26-pin D-Sub connector, solder-cups edge-mounted, male, x-pin-pitch 2.77mm, distance of mounting holes 47.1mm, distance of mounting holes 25mm, distance of mounting holes distance 63.5mm 37-pin D-Sub connector, straight/vertical, THT-mount, female, pitch 2.77x2.84mm, pin-PCB-offset 9.9mm, distance of mounting holes 25mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 44-pin D-Sub connector, solder-cups edge-mounted, female, x-pin-pitch 2.77mm, distance of mounting holes 25mm, distance of mounting holes 33.3mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector straight rugged MUSB D511 USB 2.0 Type C Plug Shenzhen Jing Tuo Jin Electronics Co 918-118A2021Y40002 ( https://datasheet.lcsc.com/lcsc/1912111437_Jing-Extension-of-the-Electronic-Co--918-118A2021Y40002_C399939.pdf ) also compatible with SOIC-8, 3.9x4.9mm² body, exposed pad, thermal vias, DDA0008J (http://www.ti.com/lit/ds/symlink/tps5430.pdf Texas Instruments HSOP 9, 1.27mm pitch, double rows Through hole socket strip THT 1x26 2.00mm single row style2 pin1 right Through hole angled socket strip, 1x39, 1.27mm pitch, double rows Through hole pin header SMD 1x19 2.00mm single row Surface mounted pin header THT 1x03 2.00mm single row Through hole angled pin header, 2x20, 2.54mm pitch, DIN 41651 / IEC 60603-13, double rows, 9.5mm latches, https://docs.google.com/spreadsheets/d/16SsEcesNF15N3Lb4niX7dcUr-NY5_MFPQhobNuNppn4/edit#gid=0 Through hole straight pin header, 2x33, 1.27mm pitch, double rows Through hole angled pin header, 2x34, 1.27mm pitch, 4.0mm pin length, double rows Through hole pin header SMD 1x22 2.00mm single row Through hole straight pin header, 1x21, 1.00mm pitch, double cols (from Kicad 4.0.7), script generated Through hole straight pin header, 1x10.

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