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Img 2015-07-08 21:01:00 -07:00 From cb3a50e19a42a9ab425057cfa1f9427c1c21d019 Mon Sep 17 00:00:00 2001 Subject: [PATCH] Fix getting a bunch of diodes and support 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.

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