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I know this is old news, but Falstad's circuit simulator is superb: http://www.falstad.com/circuit/e-cap.html. I played around with it for about 10 minutes and figured out how switching power supplies worked. All hail capacitors!
This applet shows a simple circuit involving a capacitor, which is a device that stores charge. As current flows into the capacitor, the voltage across the capacitor increases. As its voltage approach...
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