1. The voice or music is fed into microphones 2. Converted to electrical current and amplified as with disc recording.
3. The signal is then fed into an electromagnet called the recording head. Electric current passes through the coil of a magnetic head.
4. When the magnetic fields get to the head gap, some of them spread outside the core to form a fringing field.
5. When a recording medium is passed through this fringing field, it is magnetized in relation to the electric current. This is called magnetic recording
6. During playback, the motion of the device pulls a varying magnetic field across the gap. This creates a varying magnetic field in the core and therefore a signal in the coil.
7. This signal is then amplified and reproduced via speakers
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