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Old 13th May 2006, 06:29 PM   #1
jsa_ind is offline jsa_ind  United States
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Default Eddy Currents

Is it true that having metal parts near electronic circuits would generate Eddy Currents ?

If so would Eddy Currents be generated when a Aluminum Heat Sink is used on a Power Transistor block ?

Please help me understand this concept !


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Old 13th May 2006, 08:54 PM   #2
MikeB is offline MikeB  Germany
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Eddy currents are generated by magnetic induction inside metal, you need a changing or pulsating magnetic field to get them. As in a normal amplifier magnetic fields are minimal the answer to your 2nd question is NO.
You might get eddy currents if metal is close to the output inductor, but still they are too small to have any effect.

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Old 13th May 2006, 10:52 PM   #3
ilimzn is offline ilimzn  Croatia
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...at and well above audio frequencies. Eddy currents can be a problem elsewhere (for instance when air core or air gapped inductors are used - like in class D output filters - or at (V)HF) but normally in an audio amp, it's not a problem. One exception is induction from a stray field of a transformer in proximity with the circuit, but _eddy_ surrents would be far less of a problem then actual induced voltages across various circuit parts.
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Old 14th May 2006, 09:05 AM   #4
MikeB is offline MikeB  Germany
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Maybe a bit OT, but very interesting to see how destructive eddy curents can be...


Look at the Joule numbers used !

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