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Transistor increases zener rating

2016-05-09 01:40  
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The simple zener shunt in A may not handle sufficient current if the zener available is of low wattage. A power transistor will do most of the work for the zener as shown in B. Once the zener starts conducting, a bias voltage develops across the resistor (330 O to 1 K), turning on the transistor
Transistor increases zener rating

The output voltage is 0 V greater than the zener voltage.

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