Thread: Hummmmmmmmmm (feed back loop ) ....
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Meindert Sprang
 
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Default Hummmmmmmmmm (feed back loop ) ....
"Capt John" wrote in message
ups.com...
Shut your battery charger off, see if it goes away.

Or the 12-18V converter, which also contains an HF switcher.

Meindert


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