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BackSchematics 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/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm Highspeed card.
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Part="2_pin_Molex_connector" description="KK254 Molex header"/>
Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-100172.PDF), generated with kicad-footprint-generator. - -0.0816517 -0.0813929 0.993332 vertex -4.77144 -4.18796 7.82405.