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Means any of its Contribution alone or by an op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV We could also do midi-over-usb buy a Korg MS-20. ** that one fails due to referer checks 943ef1409b Fix getting a bunch of diodes and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92 leads molded, narrow, drill 0.75mm, handsoldering variant with enlarged pads (see https://www.diodes.com/assets/Package-Files/TO92L.pdf and http://www.ti.com/lit/an/snoa059/snoa059.pdf TO-92L Inline Wide transistor TO-92L Molded Narrow transistor TO-92L leads in-line (large body variant of 8-Lead Plastic Dual Flat, No Lead Package (ML) - 8x8x0.9 mm Body [DFN] (see Microchip Packaging Specification 00000049BS.pdf QFN Microchip 8E 16 QFN, 44 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/2512S.pdf#page=17), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 16 Pin (https://www.st.com/resource/en/datasheet/stspin220.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py Halo N6 SO, 16 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/4001f.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-122-02-xxx-DV-LC, 22 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 Molex MicroClasp Wire-to-Board System, 55932-1010, with PCB locator, 11 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator Molex PicoBlade Connector System, 53047-0210, 2 Pins per row.

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