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Consumer Electronics by S. P. Bali

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SERIES VOLTAGE STABILISER

In series stabilising circuits it is arranged that the voltage change of an unstabilised supply appears across a series control transistor so that the output from the transistor remains constant. The simplest arrangement of this type of stabiliser is the emitter-follower circuit as shown in Fig. 21.5.

The base electrode of the transistor is held at a constant potential by means of the zener diode. The output voltage at the emitter of the transistor can only differ from this constant potential by an amount equal to the base-emitter voltage of the transistor, which is only a small fraction of 1 volt for germanium transistors, even over the full range of emitter current.

The excess voltage between the variable input voltage ...

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