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This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellphone from a distance of one and-a-half metres. The circuit can detect both the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode.
An ordinary RF detector using tuned LC circuits is not suitable for detecting signals in the GHz frequency band used in mobile phones. Here the circuit uses a 0.22?F disk capacitor (C3) to capture the RF signals from the mobile phone.
Op-amp IC CA3130 (IC1) is used in the circuit as a current-to-voltage converter with capacitor C3 connected between its inverting and non-inverting inputs. Capacitor C3 in conjunction with the lead inductance acts as a transmission line that intercepts the signals from the mobile phone.
Capacitor C4 along with high-value resistor R1 keeps the non-inverting input stable for easy swing of the output to high state. When the cell phone detector signal is detected by C3, the output of IC1 becomes high and low alternately according to the frequency of the signal as indicated by LED1. Assemble the cell phone detector circuit on a general purpose PCB as compact as possible and enclose in a small box like junk mobile case. Use the miniature 12V battery of a remote control and a small buzzer to make the gadget pocket-size. Hi I completed this project on pcb but its not working, I tried with 9 volts power supply, cam anyone tell mw , what will be the problume, pl contact me my e mail. This is my favourite project, its too simple and very interesting because it does not require any voltage source ?? it converts RF frequency waves from cell phone (whenever you call or send a text) to little current to flash a LED. The lead’s length is very important it must be exactly what told, otherwise it might produce a lower reading.
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We are specialized in the development, manufacture and marketing of jamming devices for GPS, cellular and wireless RF communications. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. The moment the bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks.
The lead length of the capacitor is fixed as 18 mm with a spacing of 8 mm between the leads to get the desired frequency.
It is a CMOS version using gate-protected p-channel MOSFET transistors in the input to provide very high input impedance, very low input current and very high speed of performance.
This capacitor creates a field, stores energy and transfers the stored energy in the form of minute current to the inputs of IC1.
As mentioned earlier, capacitor C3 should have a lead length of 18 mm with lead spacing of 8 mm. The unit will give the warning indication if someone uses mobile phone within a radius of 1.5 meters.
It can detect output power of our FM transmitters, by simply connecting voltmeter in the place of the load(LED) of this circuit.
Conference room, auditoriums, law court, library, exam room, school, cinema, theater, museum, hospital etc. Places where using mobile phones is prohibited such as Service Station, Security Services, Military Units, Border Patrol and Drug Enforcement, Customs, etc. It is also useful for detecting the use of mobile phone for spying and unauthorised video transmission. The disk capacitor along with the leads acts as a small gigahertz loop antenna to collect the RF signals from the mobile phone.

The output CMOS transistor is capable of swinging the output voltage to within 10 mV of either supply voltage terminal.
This will upset the balanced input of IC1 and convert the current into the corresponding output voltage. But 12V voltage make the circuit become too sensitive, it will trigger even if you switch on your room lamp, so I reduce the voltage to 9V and it work fine! I cant find the same capacitors with 8mm lead spacing and 16mm lead length as mentioned in the circuit.
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Find the many types of your one problem that quickly detect bugs and camera pan tilt and spy phone, iphone app. Capacitor C5 (47pF) is connected across ‘strobe’ (pin 8) and ‘null’ inputs (pin 1) of IC1 for phase compensation and gain control to optimise the frequency response. The low-value timing components R6 and C9 produce very short time delay to avoid audio nuisance.
Your even a very small donation is very precious for the future development of Rookie Electronics. The adjustable sensitivity on this GSM Detector allows users to easily locate hidden cellphone or locate hidden GPS Trackers in a car, van, employee vehicle, truck, motorcycle or anywhere else. With the advances in electronic eavesdropping technology and Spy Software, there's a big chance that someone might be tracking your moves or listening to your private conversations.

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