check this video out,Dave watch the movement @ 30 s and 1min 30s
russian (translate it in google )
electromechanical resonance coil
�лектромеханиче�кий резонан� �оленоида - YouTube
russian (translate it in google )
electromechanical resonance coil
constant pulse current 40A, the frequency varies from 1 to 40Hz
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