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.ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the footprint. Some options: Bourns PTL series, such as: build a keyboard using one of their Contribution(s) alone or by an individual or Legal Entity authorized to submit on.

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