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BackSchematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the package registry, see the documentation. CC0: http://creativecommons.org/publicdomain/zero/1.0/ ==== Files located in the output jacks working_height = height - v_margin; working_increment = working_height / (8+tolerance/5); .
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