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Magnetic Buzzer
　
Magnetic buzzer structure and theory introduction
　
　　The coil is located in the magnetic circuit consisting of a permanent magnet, an iron core, a high permeable metal disk, and a vibrating diaphragm.

The disk and diaphragm are attracted to the core by the magnetic field . When an oscillating signal is moved through the coil, it produces a fluctuating magnetic field which vibrates the diaphragm at a frequency of the drive signal. Thus, sound is produced relative to the frequency applied.
 
　
Construction：
　
1. Masking label
2. Bobbin
3. Coil
4. Magnet
5. Base
6. Pin
7. Case
8. Core
9. Potting material
10. Magnet piece
11. Diaphragm
12. P.C. Board
　 　
Operation Principles of internal drive circuit type
　
a.Continue tone
b.Pulse tone
　 Remark: T: Response time
The relation between SPL and response time is as following.
　
　 It is recommended that response time is longer than 50ms.
　
　
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