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Back.ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.schmitzbits.de/ms20.html which is copyrighted by the Mozilla Public License, Version 2.0.
- LS, Handsoldering, https://katalog.we-online.com/pbs/datasheet/7447715906.pdf Shielded Power Inductor, SM-PIC0612H.
- 55935-1510, with PCB locator.