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Old 02-09-2014, 03:05 PM
thx1138 thx1138 is offline
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Join Date: Jan 2012
Posts: 371
Barkhausen effect

An excellent video to understand the Hendershot Mk3 is at the link below. At about 2:56 the demonstration uses a soft iron rod. Note that the static created by the amplifier is heard both when the magnet is moving toward and away from the coil. It also explains why iron is preferable to steel and shows, while using the steel bolt, the effect of reversing the magnetic field.
The Barkhausen effect - YouTube

Looked at in this light, the rest of the Hendershot device is the amplifier.
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