User's Manual

GE864
GE864GE864
GE864-
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-QUAD V2 / GE864
QUAD V2 / GE864QUAD V2 / GE864
QUAD V2 / GE864-
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-DUAL V2 Hardware User Guide
DUAL V2 Hardware User GuideDUAL V2 Hardware User Guide
DUAL V2 Hardware User Guide
1vv0300875 Rev.1 – 2010-03-29
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved. Page 54 of 73
Example of Buzzer ’ s driving circuit
NOTE:
NOTE:NOTE:
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.
11.7. Magnetic Buzzer Concepts
11.7.1. 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
TR1
BCR141W
TR2
SMBT2907A
R1
4,7K
R2
1K
D1
D1N4148
C1
33pF
+
-
+V buzzer
GPIO7