What's wrong with the high frequency sound when using LED lights?

Hobby

When I turn on the LED light, there is a high frequency sound, so what's the problem?

Or is it the characteristic of the original LED lighting?

212 3 8 years ago

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pu1. I use LEDs at home, but I haven't seen anything like that

2017-11-25

pu2. I think there's something wrong with the SMPS (Switching Mode Power Supply)

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pu3. Thank you!!

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