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And .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads molded, narrow, drill 0.75mm TO-92Flat package, often used for hall sensors, drill 0.75mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile, JPin SMD 6x-dip-switch.

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