Cell phone detector principle,cell phone monitoring software download,telephone number gps locator,yellow pages reverse telephone number - Tips For You

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 Mobile Phone Detector can detect regular or concealed GSM mobile devices, making it perfect for counter surveillance! Today, more than ever, mobile phones are being used to illegally record and send both audio and video to third party locations.
Berkeley Varitronics Systems offers this Wolfhound cellphone detector, a handheld, wireless sniffer that allows security personnel to locate all nearby cell phones in either standby mode or actively using voice, text (SMS) or data transmissions. In today's high tech environment, we have instant minute by minute communications but the same instant on-the-go communications can be abused in many illegal ways. This new generation law enforcement grade, pocket sized unit is all you need to instantly and silently detect the use of cell phone transmissions so your conversations, meetings, and information remain security with no leaks!
Speak with a technician right now for free to insure that you are selecting the right product(s) to satisfy your specific needs. This pocket-sized mobile 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.
It’s high speed scanning receiver utilizes a multi-band DF (Direction Finding) antenna system.

Your private communications audio form, video form and still photo form can be instantly be illegally transmitted by advanced cell phone technology without your knowledge but now there is a Law Enforcement grade countermeasures device that instantly detects this! Mobile phones are being used to illegally record and send both audio and video to third party locations.This new generation law enforcement grade unit instantly detects this illegal eavesdropping! For peace of mind and for secure communications, get your unit today as it just could end up saving you tens of thousands of dollars in losses due to information leaks!
So it can be used to avoid the use of mobile phones in private rooms, examination halls, etc. This high grade pocket sized unit will silently vibrate when it detects a mobile phone that is in use!
The first shipments of this new high end Lawmate grade unit will ship the first week of July so order yours now and be the first in your area to use this new technology! It is also useful for detecting the use of mobile phone for spying and other related activities. Since it does not jam the signal nor tape into the signal, these units are legal to use in this form.
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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