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Saturday, August 21, 2010

Mobile bug


CONTENTS
     * INTRODUCTION
    * CIRCUIT DIAGRAM
    * WORKING
    * PIN CONFIGURATION OF IC
    * APPLICATIONS
    * LIMITATION

CIRCUIT DIAGRAM
How the circuit works?
  •  Ordinary LC (Coil-Capacitor) circuits are used to detect low frequency radiation in the AM and FM bands.
  • The tuned tank circuit having a coil and a variable capacitor retrieve the signal from the carrier wave.
  • But such LC circuits cannot detect high frequency waves near the microwave region. 
  • Hence in the circuit, a capacitor is used to detect RF from mobile phone considering that, a capacitor can store energy even from an outside source and oscillate like LC circuit.
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