Df Battery Charging Screeching Noise

Started Dec 24, 2013 | Discussions thread
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Re: Df Battery Charging Screeching Noise
In reply to dL302, Dec 24, 2013

Never had one do that.

They probably use a switch mode power supply and what you are hearing is the switching frequency of the circuit.

Sometimes a loose winding in a transformer will buzz or sing with the frequency it is operating at.

Probably not a problem, but if you feel better, return it.

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