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3. Buzzer Circuit
When the buzzer is to be activated, buzzer output pin
30
of the micro computer alternates between ON and
OFF repeatedly at 4kHz and Q302 is turned ON/OFF accordingly. A 4kHz voltage is applied to the buzzer
and the diaphragm of the buzzer vibrates to output 4kHz sound.
4. Receive circuit
Infrared signals from the wireless remote controller are received by the light receiving unit and output after
being amplifi ed and shaped.
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