Telit Communications S.p.A. GC864Q2 ユーザーズマニュアル
GC864 Hardware User Guide
1vv0300874 Rev.0 – 2010-01-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 50 of 64
Example of Buzzer
’
s driving circuit
NOTE:
To correctly drive a buzzer, a driver must be provided; its characteristics depend on
the Buzzer and for them refer to your buzzer vendor.
the Buzzer and for them refer to your buzzer vendor.
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.
circuit consisting of a permanent magnet, an iron core, a high permeable metal disk,
and a vibrating diaphragm.
Drawing of the Magnetic Buzzer
TR1
BCR141W
TR2
SMBT2907A
R1
4,7K
R2
1K
D1
D1N4148
C1
33pF
+
-
+V buzzer
GPIO7