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quote:Originally posted by syhprumThe answer is very simple, when your TV is on standby the Chopper type power supply is still running to supply power to the remote control receiver.These P.S.U run at 15.625 Kz and due to magnostriction effects in the cores of the transformers that they use generate sound at this frequency which young people can hear.Small P.S.U for phone chargers etc use a similar systemsyhprum
quote:Originally posted by AmosWhen the world is relatively quiet, I could swear that I hear electricity. Even when the screen on my TV is black, I hear a high frequency pitch that tells me it's still on. And, when I look closer, I see that I'm right and turn it straight off. I've never been wrong.This high pitch ring can also be heard when small devices are charging, like cell phones and iPods. Am I going crazy? I suppose the answer has something to do with currents, wavelengths, and thus frequencies and pitches ... but I'd like to be more precise if I'm going to live the rest of my life with a ringing in my ears.