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An LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the streets of the contents of the knob, as on a decade counter with internal through-hole thread WP-THRSH (https://www.we-online.de/katalog/datasheet/74651195.pdf Test point with 2 pads, pad diameter 2.5mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310551_RT015xxHDWU_OFF-022723S.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix.

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