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Old 19th June 2008, 04:09 PM   #1
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Default Generally buzzing is a bad thing, right?

I have an old solid state radio... I plug it in and I get a faint buzzing through the wooden case from the transformer area.... even with the radio OFF!!!

If I turn the radio on the buzzing stays, but the radio plays clear and perfect with no hum or distortion.

The whole buzzing when not turned on thing has me kinda freaked though... any idea what this could be?

Charles.
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Old 19th June 2008, 08:09 PM   #2
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Not with mains fully disconnected I may hope?

/Hugo
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Old 19th June 2008, 08:15 PM   #3
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Sorry, right. You said plugged in but turned off.
Strange, I would think of a standby transformer under power.
Does the unit have a St-by function?

/Hugo
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Old 19th June 2008, 10:52 PM   #4
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Default Re: Generally buzzing is a bad thing, right?

Quote:
Originally posted by ChopperCharles
I have an old solid state radio... I plug it in and I get a faint buzzing through the wooden case from the transformer area.... even with the radio OFF!!!

If I turn the radio on the buzzing stays, but the radio plays clear and perfect with no hum or distortion.

The whole buzzing when not turned on thing has me kinda freaked though... any idea what this could be?

Charles.
It just sounds like the transformer laminations buzzing.
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Old 20th June 2008, 02:48 PM   #5
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I agree. The transformer acts as a loudspeaker. It creates a magnetic field proportional to the ac voltage applied and the laminations or something arround the transformer moves pulled by that field.
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Old 20th June 2008, 03:41 PM   #6
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So, not something to worry about then? Or something that will burn my house down if I leave it plugged in?

Charles.
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Old 20th June 2008, 05:35 PM   #7
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Still a mystery to me as if I understand it correctly, OFF is off which means the mains switch is open.
In a safe design, the mains switch is located before the transformer.

/Hugo
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Old 20th June 2008, 05:36 PM   #8
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woodworm ??
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Old 20th June 2008, 06:41 PM   #9
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TV set nearby?
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Old 20th June 2008, 08:14 PM   #10
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a lot of ss battery/mains radios had (and have - I have a CD combo with this) a single on off switch after the mains supply which switched the power. so as long as the radio was plugged in the transformer was powered.

the buzz is probably loose laminations, open the case and paint with varnish with a bit of luck this should stick the loose parts together.

I consider this to be a dangerous practice but it obviously passes safety standards as these things are still on sale, proberly considered like a wall wart in this regard
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