Power supply circuits
Although cells and batteries are a handy way of supplying power to portable equipment, they are expensive to replace. Even rechargeable cells have a limited life. For many kinds of equipment, it is preferable to obtain power from the mains and convert it to a form suitable for driving electronic circuits. This chapter deals with such power supplies.
Rectifiers
Almost all electronic circuits need a d.c. power supply. The action of an npn transistor requires the collector to be positive of the emitter, and it does not work if the polarity is reversed. An alternating power supply is of no use. The same applies to other transistors and related devices. Batteries provide a d.c. supply and are particularly suitable for portable ...
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