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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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 9x-dip-switch SPST , Slide, row spacing 11.48 mm (451 mils 20-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size 6.7x26.96mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/209-210.pdf), LowProfile 6x-dip-switch SPST , Slide, row spacing 8.61 mm (338 mils), body size (see https://www.ctscorp.com/wp-content/uploads/194-195.pdf 3x-dip-switch SPST , Slide, row spacing 9.53 mm (375 mils), Clearance8mm 16-lead surface-mounted (SMD) DIP package, row spacing 16.51 mm (650 mils), SMDSocket, LongPads 8-Lead, 300\" Wide, Surface.

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