rajkot

Monday, March 22, 2010

MOBILE INCOMEING CALL INDICATOR

  1. This circuit can be used to escape from the nuissance of obile phone rings when you are at home.This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated.
  2. When a call is coming to the mobile phone, the transmitter inside it becomes activated.The  frequency of the transmitter is around 900MHz.
  3.  The  coil L1 picks up these oscillations by induction and feds it to the base of Q1.This makes the transistor Q1 activated.
  4.  Since the Collector of Q1 is connected to the pin 2 of IC1 (NE555) , the IC1 is triggered to make the LED connected at  its output pin (pin 3) to blink.The blinking of the LED is the indication of incoming call.

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