Quote:
Originally Posted by Fred
December 99 was another magnetic detetector.
I think the one Esteban posted was using a power supply transformer as sensor and claimed to detect a train kilometers aways, i d´nt know if it was an electric powered train or detection was of the moving metallic mass, what would be amazing.
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If you put a magnet near a sensor, vibrations of big machinery can be detected at km... here the magnet also vibrates and is produced a AC voltage.