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Original Message
RE: So what's the deal with CD demagnetizers?
Posted by pictureguy on June 16, 2016 at 13:52:46:
It would be SIMPLE to test.
You need a coil of wire, a DRILL (or dremel, better yet) and a DVM.
SPIN the CD at high speed. Hold the coil close to the CD and measure for MV. (Milivolts)
Experiment with orientation of coil. Voltage should be in some way proportional to rotation speed.
Done and done.