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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.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF ~$8 in parts, needing only one tl074 and support Kassutronic's KS-20 VCA MK's VCA Everything by Hagiwo (quantizer, filters, noisemakers, etc) MIDI-to-CV, either over USB or directly over 5-pin DIN (with optoisolator) What we build next? Pretty confident we do these in this Agreement is intended to be one massive file. Fork it and submit PRs to improve it * if you want wider holes for a single 0.75 mm² wires, basic insulation, conductor diameter 0.9mm, length 10.0mm, width 3.5mm, e.g. Ettinger 13.13.890, https://katalog.ettinger.de/#p=434 Through hole angled socket strip THT 1x34 2.00mm single row Through hole straight pin header, 2x09, 1.27mm pitch, single row Through hole straight socket strip, 1x26, 2.54mm pitch, single row Through hole socket strip THT 1x27.

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