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Cellphone Detector Circuit


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The most widely recognized electronic hardware utilized now-a-days is Cell Phone or Mobile Phone. With headway in correspondence innovation, the necessity of cell phones has expanded significantly. A cell phone commonly transmits and gets flag in the recurrence scope of 0.8 to 3GHz. This article gives a basic circuit to recognize the nearness of an enacted cell phone by detecting these sign.

This circuit can be utilized to escape from the annoyance of mobile phone rings when you are at home. This circuit will give a visual sign using light emitting diode (LED) whenever set close to a mobile phone regardless of whether the ringer is deactivated.

Applications of Cellphone Detector Circuit

This circuit is useful in restricted areas to check if there is any mobile phone active in this area or not.

This circuit can be utilized at examination corridors, gatherings to distinguish nearness of mobile phones and counteract the utilization of cell phones.

It very well may be utilized for detecting mobile phones utilized for spying and unauthorized transmission of sound and video.

It very well may be utilized to distinguish stolen mobile phones.

Circuit Diagram of Cellphone Detector:

The circuit diagram of Cellphone Detector is given in following figure.

Circuit Diagram of Cellphone Signal Detector
Circuit Diagram of Cellphone Signal Detector

Required Components:

Op-Amp 741
Piezo Buzzer
10k variable resistor
Antenna or a rapped wire in place of antenna
LED
Bread board or Vero board
9 Volt Battery
Battery Connector
Connecting wires

Practical Circuit on Vero board:

The above circuit can be build on Vero Board as given in the following picture:

Practical Circuit of Cellphone Signal Detector
Practical Circuit of Cellphone Signal Detector

Limitations of Mobile Phone Detector Circuit

It is a low range detector, of the order of centimeters.

It is less sensitive to detect low or small signals.

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