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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 either internal or external clock sources cycle between 0v and 5v max // gate out // 1 rotary switch, 5+ positions 10 LEDs - Consider: 1 simple on/off switch/button/knob/etc. Cb3a50e19a More tweaks after pro review Apply jlcpcb's design rules, small fixes for those Fireball/Fireball.kicad_pro | 8 | 1N4148 | Standard switching diode, DO-35"/>

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