Simple voltage stabilizer
In the simplest case emitter follower is used, the base of regulating transistor is directly connected to voltage reference:
The stabilizer makes use the power source, having voltage Uin which may vary over time. It delivers the relatively constant voltage Uout. The output load RL can also vary over the time. For such a device to work properly the input voltage should be larger than the output voltage and Voltage drop should not exceed the limits of transistor used.
The output voltage of stabilizer is equal to UZ - UBE where UBE is about 0.7v and depends on load current. If output voltage drops below that limit, this increases voltage difference between the base and emitter (Ube), opening transistor and delivering more current. Delivering more current through the same output resistor RL increases voltage again.
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