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2.Receive Circuit
Light receiving
¥ The Light receiving unit receives an infrared signal from the wireless remote control. The receiver amplifies
and shapes the signal and outputs it.
3.Buzzer Circuit
¥ When the buzzer sounds, an approx.
3.9kHz square signal is output from
buzzer output pin
computer. After 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 buzzer's sound.
R419
C405
0V
unit
0V
Micro computer
37
Buzzer output
of the micro
37
Sound wave
5V
R601
C610
0V
Fig.3-1 Buzzer Circuit
Metal diaphragm
184
Wireless input
57
C601
Micro computer
0V
12V
R701
BZ
Q701
0V
V
Fig.3-2 Buzzer Operation
Piezoelectric element
V
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