This is a circuit for simple voltage stabilizer circuit that employs a resistor, a zener diode, and an NPN transistor. In this circuit, the zener diode is used to stabilize the base voltage of the NPN transistor, which carries the load current. This is the figure of the circuit;
The load transistor is in series with the load, which is why this circuit is also known as a series stabilizer. Unlike the amplified zener shunt stabilizer, the dissipation of the transistor increases only when the actual load current increases, making its operation more efficient.
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