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admin | Category: Yellow Pages Reverse Phone Lookup | 13.09.2013
Here is a simple engineering project circuit of handy mobile cell phone detector (sniffer). This circuit can notice the use of GSM mobile phone in mobile restricted areas such as examination hall or confidential rooms etc. The sniffer keeps monitoring the RF (Radio frequency) level in the region and gives warning if the RF level increases due to mobile phone activity. The circuit is able to detect all forms of mobile phone activity even when it is in silent mode.
Since the voltage from the sensor diode is too weak, three stages of amplification are required to give warning indication through speaker.
The pre amplified signal is fed to next amplifier stage built around IC TL071, it is a low noise JFET input op amp with low input bias and offset current. Here the TL071 is designed as an inverting amplifier; the inverting input of op amp receives the pre amplified signal from the first part. The amplified signal is then passed through a capacitor and diode; with the help of this arrangement we can introduce more stages to extend the range. The next potentiometer is used to vary the signal amplitude, then it is fed to amplifier stage built around IC LA4440, it is a two channel audio power amplifier with inbuilt dual channels for stereo and bridge amplifier applications.


When the mobile phone is activated within the range of eight meters, a loud motor sound is heard through the speaker. The RF reception and performance of the circuit is dependent on many factors such as output power from the mobile device, orientation and position of the cell phone.
1 – a simple piece of wire for the design you’re talking about, can he effectively detect the frequency of the two band GSM 900MHz and DCS 1800MHz? Hey i try to find the 1N3491 diode everywhere from last 6 months, but failed again and again. Sir,can I proceed with this circuit for my mini project?I managed to get all the components..Could you please give me a design of this circuit? CircuitsGallery introducing 'The NEW CG PROGRAM STORE', from where you can buy embedded program codes. Our YouTube channel provides collection of various video demonstration of Circuits, Engineering Projects, Simulations etc. This pocket-sized┬ámobile communication detector or sniffer can sense the existence of a mobile device. It is a high frequency (Microwave frequency) low power transistor with huge current gain (approximately 15dB at 0.5GHz) and bandwidth.


It has good ripple rejection of 40dB, small residual noise, built in over voltage and surge voltage protection, and pin to pin protection. So it can be used to avoid the use of mobile phones in private rooms, examination halls, etc. It is also useful for detecting the use of mobile phone for spying and other related activities. The circuit can detect incoming and outgoing calls, SMS, MMS, GPRS usage and video transmission even when the mobile phone is set aside in silent mode. The instant bug detects RF (Radio Frequency) transmission signal from a mobile phone, it produces a beep sound alarm.



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