A potential divider, also known as a voltage divider, is a simple yet essential circuit used to reduce voltage to a desired level. It consists of two resistors connected in series close seriesA ...

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When voltage over the resistor drops too much, the transistor turns off, and so does the circuit. You could even use a pair of resistors as a voltage divider, which would do the same thing.

Applications sometimes require the generation of a voltage that is below the reference rail. Many design engineers would just use a second regulator to generate this voltage. ...