题目内容
A bridge rectifier uses four diodes connected in a bridge network to produce a full-wave varying DC output .
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Filtering is performed by a large value electrolytic capacitor connected across the DC supply, supplying current to the output when the varying DC voltage from the rectifier is falling.
The diagram Fig. 3-9 shows the unsmoothed varying DC (dotted line) before filtering and the smoothed DC (solid line) after filtering .
The capacitor charges quickly near the peak of the varying DC, and then discharges as it supplies current to the output, smooths the DC from varying greatly to a small ripple.
Voltage regulators are circuits designed to maintain the DC output at constant amplitude. Voltage regulator ICs are available with fixed（typically 5, 12 and 15V）or variable output voltages.
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