Syed

  Overview: Mobile Phone Detector Circuit Mobile Phone Detector  is a Circuit that detects the presence of  Mobile Phone  up to a certain range like 1.5 meter . It detects the phone when an  incoming call  or  outgoing call  is made or when an  SMS is sent  or  received  or any  GPRS used . When the circuit detects an  RF signal  from an activated mobile phone, it gives an indication by  switching ON  an  LED . The LED will start blinking and continues to blink until the  incoming/outgoing signal  stops.  Mobile Phone detector  can also be called as a Frequency Detector.  Frequency Detector  is simply a  Current to Voltage Converter Circuit  which detects the frequencies in between the range of about  800 MHz to 3GHz . Bill of Materials S.N. COMPONENTS DESCRIPTION QUANTITY 1 LM358 Dual Op-Amp IC 1 2 Resistor 1 KΩ 1 3 Resistor 100 K Ω 1 4 Resistor 220 K Ω...