LM431 adjustable precision zener shunt regular:

The LM431 is used like an adjustable zener diode.

LM431 Programmable Shunt Regulator Adjustable Voltage component diagram by electronzap electronzapdotcom
LM431 Programmable Shunt Regulator Adjustable Voltage component diagram by electronzap electronzapdotcom

After first receiving my LM431 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

LM431 shunt regulator trimpot controled power supply above set voltage indicator test circuit


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