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. Buzzer Circuit
ODEL RAD-25NH5, RAD-35NH5, RAI-25NH5, RAI-35NH5, RAI-50NH5
When the buzzer sounds, an approx.
3.9kHz square signal is output from buzzer
output pin
of the microcomputer. After
30
the amplitude of this signal has been set
to 12Vp-p by a transistor, it is applied to
the buzzer. The piezoelectric element in
the buzzer oscillates to generate the
buzzerÕs sound.
ODEL RAK-18NH5, RAK-25NH5, RAK-35NH5, RAK-50NH5
All manuals and user guides at all-guides.com
icrocomputer
30
Buzzer output
Fig. 3-1 Buzzer Circuit
Sound wave
3-3
- 258 -
12V
R722
BZ
BZ
Q722
0V
etal diaphragm
V
Fig. 3-2 Buzzer Operation
Fig. 3-4
Buzzer Operation
Pizoelectric element
V
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