An electric current in a coil of wi

An electric current in a coil of wire produces a magnetic field similar to that of a bar magnet, and that field is much stronger if the coil has a ferromagnetic (iron-like) core.

Tape heads are made from rings of ferromagnetic material with a gap where the tape contacts it so the magnetic field can fringe out to magnetize the emulsion on the tape. A coil of wire around the ring carries the current to produce a magnetic field proportional to the signal to be recorded. If an already magnetized tape is passed beneath the head, it can induce a voltage in the coil. Thus the same head can be used for recording and playback.
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The basic tape head action involves an oscillating current in a coil. The magnetic field produced in a ring of ferromagnetic material fringes out to the tape material at the gap. For stereo cassette tape heads, there are two such mechanisms to record and playback from parallel tracks on the tape.

Kết quả (Anh) 1:

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