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On ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF 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 a decade counter with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650073.pdf screw terminal block RND 205-00007, 8 pins, pitch 7.5mm, size 6.5x15mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-3-7-5.08, 7 pins, pitch 3.5mm, size 24.5x7.6mm^2, drill diamater 1.15mm, 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_MetzConnect THT terminal block RND 205-00084 pitch 10mm size 55x10.3mm^2 drill 1.3mm pad 2.5mm Terminal Block Phoenix PT-1,5-10-3.5-H, 10 pins, pitch 5mm, size 70x9mm^2.

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