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Message: [QUOTE="76GMC1500, post: 1125609, member: 73139"] After passing AC current through a bridge rectifier, you still don't have a constant DC voltage. The current travels in one direction, but the voltage varies from peak to 0. A capacitor will store energy during the peak voltage and fill in the troughs to make a voltage that is more constant. The higher the load, the less of an affect the capacitor will have, though. It's not necesary for a charging circuit, but doesn't hurt. [/QUOTE]