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Schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the cylindrical part of the 600v monsters we've been using From 68726f9fe082df8f029089edeb63d89037321450 Mon Sep.

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