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Verfügbare Sprachen
Verfügbare Sprachen
2. Receive
Circuit
Light receiving
unit
Micro computer
@ 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
Micro computer
Buzzer output (21)
Fig. 3-1 Buzzer Circuit
@ 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
transistor, it is applied to the buzzer.
The piezoelectric element in the buzzer
ata
a a aa
oscillates to generate the buzzer's sound.
Metal diaphragm
Pizoelectric element
ae
a
ot:
=
in
ania
Vv
Vv:
Sound wave
ae
N__
7
eee
at
2
ee
a
Fig. 3-2 Buzzer Operation
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