Power Supply Circuits


Nearly all electronic systems require one or more sources of stable DC voltage. Yet many systems get their input power from the standard 120-VAC power line. Even battery-powered units may require stable DC voltages at levels other than those provided directly by the battery. Figure 6.1 shows the basic role played by a voltage regulator circuit and where it fits in the power distribution scheme.


FIGURE 6.1 A voltage regulator circuit provides constant voltage to a load.

If the system receives its power from the 120-VAC power line, the first step is usually voltage reduction ...

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