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** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a work in progress; better README to come soon. Meanwhile: **Untested hardware and software — Do not assume anything works!** This is a guessed value; could be other values, ceramic may work, test debouncing. Maybe enlarge footprint if needed. Subject: [PATCH 1/2] Fix rail clearance = ~11.675mm, top and bottom railHeight .

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