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diyAudio Member

Registered: January 2004
Location: away
Posts: 5,002
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Here are the same three inductors, but this is the series resistance of the coils. Note that the free air coils start to climb in the 2 to 3 KHz range, while the ones against the copper foils start to rise in the 400 to 500 hz range. The meter is seeing the eddy current losses in the pcb copper and reporting it as part of the Rs of the inductors.
Date: Mon December 23, 2013

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