Especial magnet circuit voicecoil cheking

In this video they will be able to see the manufacture of the coil for the special magnetic circuit they saw in the video
The assembly of a kind of speaker for the circuit polarity test of the windings and the test with a frequency of 60Hrz. of the upper winding and the lower winding as the two windings in series.
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Видео Especial magnet circuit voicecoil cheking канала Luciano