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2. Receive
Circuit
5V
ov
R621
unit
(18) Wireless input
Micro computer
3. Buzzer
Circuit
Micro computer
Buzzer output (21)
@ When
the buzzer sounds, an approx.
3.9kHz square signal is output from
buzzer output pin @)) of the micro
computer.
After the amplitude of this
signal.has been set to 12Vp-p by a
oscillates to generate the buzzer's. sound.
an
™~
a
__
+
-
Vv
Vv
Sound wave
a
Se
ee
~
"SS
©.
Se
Fig. 3-2 Buzzer Operation
—96—
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