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When you turn the radio off, you interrupt the AC supply from the wall outlet to

the radio's power supply. If there's energy stored in the power supply components

at the time, then the radio continues to operate on that energy. An AC power

supply typically includes large-value electrolytic capacitors, which continue to

power the radio for a short time until they're discharged.

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Q: Why do ac radios still have a soft hum after being turned off?
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