User's Manual

GL865-DUAL/QUAD V3 Hardware User Guide
1vv0301018 Rev.7 – 2013-10-30
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 53 of 78
Mod. 0805 2011-07 Rev.2
11.8. Magnetic Buzzer Concepts
11.8.1. Short Description
A magnetic Buzzer is a sound-generating device with a coil located in the magnetic circuit
consisting of a permanent magnet, an iron core, a high permeable metal disk and a vibrating
diaphragm.
Drawing of the Magnetic Buzzer.
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 the frequency of the drive signal. Thus the sound is produced relative to the
frequency applied.
Diaphragm movement.