File talk:Voltage stabiliser transistor.png

    Simple voltage stabilizer

In the simplest case, the base of the regulating transistor is directly connected to the voltage reference:

The stabilizer uses the power source, having voltage Uin that may vary over time. It delivers the relatively constant voltage Uout. The output load RL can also vary over time. For the proper work of such device the input voltage must be larger than the output voltage and the output current must not exceed the allowed transistor limit. The output voltage of the stabilizer is a little lower than the output of the voltage reference circuit Rv-D1 (output Uz). If the output voltage drops below that limit, this increases the voltage difference between the base and emitter (Ube), opening the transistor and delivering more current. Delivering more current through the same output resistor RL increases the voltage again. —Preceding unsigned comment added by 213.55.92.82 (talk) 20:34, 12 February 2008 (UTC)