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Consumer Electronics by S. P. Bali

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TRANSISTOR SHUNT STABILISER

An improvement over the diode shunt stabiliser can be obtained with a transistor circuit as shown in Fig. 21.4. A transistor is connected across the supply, with its base electrode fed through a zener diode. The input voltage and base resistance are again set so that the zener diode is biased into the breakdown region. If the input voltage increases, the zener diode passes more current, which increases the base current of the transistor and causes a much larger current to flow down through the transistor. This increase of transistor current results in an increased voltage drop across the series resistance, RS, so that the output voltage is maintained almost at its original value.

 

 

Fig. 21.4 Transistor shunt ...

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