题目内容
The diagram Fig. 3-9 shows the unsmoothed varying DC (dotted line) before filtering and the smoothed DC (solid line) after filtering .
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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.
The regulated DC output is very smooth with no ripple. It is suitable for all electronic circuits.
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