LM341 adjustable precision zener shunt regular:

The LM431 is used like an adjustable zener diode.

Right after I got my LM341 components, I made the video below. I came across the schematic diagram for this circuit, which lights 2 series LEDs when the voltage of a power supply (battery) drops below a set voltage.

LM431 adj precision zener shunt regulator component wired as low 9V battery indicator circuit

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