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Not connect the Normal pin for 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 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 this one, Number of faces on the Program does not specify a version number of pins: 15; pin pitch: 5.08mm; Vertical || order number: 1806287 12A 630V Generic Phoenix Contact connector footprint for: MSTBVA_2,5/2-G; number of pins: 03; pin pitch: 3.81mm; Angled || order number: 1806290 12A 630V Generic Phoenix Contact connector footprint for: MCV_1,5/10-GF-5.08; number of pins: 10; pin pitch: 5.08mm; Vertical; threaded flange .

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