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LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on either internal or external clock sources cycle between 0v and 5v or even much less. This can be found at https://www.gme.cz/data/attachments/dsh.511-795.1.pdf LED automotive super flux 7.62mm LED_SideEmitter_Rectangular, Rectangular, SideEmitter.

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