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Consumer Electronics by S. P. Bali

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VOLTAGE REGULATION

Any change in “B+” supply voltage level may cause transistors to operate improperly. To stabilise the operating voltage, a voltage regulator circuit is used. As the load current taken from a normal rectifier circuit is increased the output voltage will fall, partly due to the ohmic resistance of the transformer windings, the rectifiers and the smoothing elements, and partly due to the lower effective storage efficiency of the reservoir capacitor with the lower load resistance. In many applications the load current will vary as, for example, in class B and switching circuits, and it is then desirable to include some form of stabilisation to maintain the output voltage constant. Various arrangements can be used depending upon ...

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