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Eddy currents
alter sound and output of a pickup and play an important role in pickup
design.
Eddy currents are induced in metals in the vicinity of an AC magnetic
field, creating a secondary magnetic field which opposes the inducing
magnetic field of the coil. The dimensions, conductivity and permeability
of the metal, along with the frequency of the current in the coil, determine
the magnitude and phase relation of the eddy currents. An internal short
in a pickup coil forms a conductive loop which, also, becomes the source
for internal eddy current interference.
Copyright
© 1996-2010 Bill Lawrence
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