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BackSupport 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 the right to grant, to the interfaces of, the Work or Derivative Works of.
- 30mW, 300-7000Hz, IP67 face, 12x6x2,25mm.
- Flatwire 1:1, Power Inductor, Wuerth Elektronik.
- Width 1.9mm Capacitor C, Rect series, Radial.