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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 front Don't put R8 so close to R26 -- D36/R47 too close From 53c90c58d81dff355f8b17948a9b73c895233eb2 Mon Sep 17 00:00:00 2001 .../Panels/PRISMATIC SPHERE.png | Bin 0 -> 47687 bytes Hardware/PCB/precadsr/precadsr.pro .

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