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Project SummaryThis is a mobile phone sniffer circuit that can detect the signals being used in the GSM (Global System for Mobile Communication) band at about 900 MHz.
The diodes, gain of the amplifiers and the length of the antenna is critical in this circuit. I was about half way through designing something very similar using almost the same components.
Is there a possibility to get a more detailed discription on the circuitry operation to my email? I am electrical engineering student doing design I have taken a cell dector as my project and It is working but I want to put and 16by2 lcd display but i cannot interface a microcrontrller with the lcd display.Please can please give me ideas or websites I can get this information. This cell phone detector circuit can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters. If a RF signal is detected the cell phone detector circuit will inform you using a sound alarm (beep sound ) and a blinking LED .
In this type of circuit (that use high frequency 0.9-3Ghz ) you can not use an LC circuit for frequency tuning  .
The circuit uses a 0.22?F disk capacitor (C3) to according the RF circuit to ensure the capability of the circuit to capture the mobile phone signal .
This cellular phone detector can detect any activity of a mobile phone : incoming or outgoing SMS , video transmission or voice transmission .
The C3 capacitor must have leads length of 18 mm with 8 mm spacing between leads to obtain the desired frequency .  This small disk capacitor acts as a small gigahertz loop antenna to collect the RF signals  . This cellular phone detector electronic circuit diagram can be used to verify the presence of an active cellular phone in the tested area .
Check if is there some other devices around; also you can try to shield antenna with an aluminum box and see what is happen. I've connected this circuit but of electronic alarm and diode works directly during the closure of the circuit without the presence of mobile phones. This circuit only works for RF signal ,if u want circuit works in off condition .u will use mobile jammer circuit.
This circuit only detect RF signal, so it can not be used to detect a network or to detect a switched off phone.
I tried to connect the circuit, cell phone dector but it wasnt sensing and i even tried to make some calls but still not responding.
CAPTCHAThis question is for testing whether you are a human visitor and to prevent automated spam submissions. This circuit can be used to escape from the nuisance of mobile phone rings when you are at home.
The coil L1 can be made by making 150 turns of 36 SWG enameled copper wire on a 5mm dia plastic former.Or you can purchase a 10 uH coil from shop if available. I want to check this circuit in software.As frequency of 900MHz cannot be transmitted in inductor in software design,How can I check this circuit in software.Can I replace inductor with frequency generator directly? LED will glow if any incoming call to mobile means,during that time the frequency range from 900Mhz ok. If i want to use more than one led (say 5) , and i put them in series with each other , how much volts battery will i need to use ? Either remove D1 for 9 volt operation or reduce the supply to 1.5 volts with D1 for pumping the required voltage of 3V to LED.
Please go through the notes for making your own inductor which will be more sensitive than small wound inductors. A very small, flashing LED should consume very little power and not be too detrimental to battery life.

After receiving a call or SMS, most phones go to standby with a black screen, so just by looking at the phone you have no idea if anything has happened — unless you happened to be close by, when the event occurred. Can the NE555 IC operate at 1.5V supply or do we need to change it to a CMOS chip like 7555?
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.
There was a time when an RF jammer was placed at our prisons because the prisoners there were using them to scam people. If that bucket prevents the signal from the jammer, then it also must stop the signal from the cell phone going out. It seems to allow them to stop the jammers but not the GSM operators signals, i don't have a logical explanantion. Frequencies are very high and you need special equipments and soldering is another problem. CrazyEngineers (CE) is creating an ecosystem for professional engineers and engineering students in over 180 countries.
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Since the signals are digitally encoded, it can detect only the signal activity, not the speech or the message contents. The wire type is not critical but its better to choose a fairly thick wire that will not bend too easily. I wouldn't place my hopes in this circuit's working as advertised except when it is held *next* to a GSM phone -- it needs a strong signal to work.
I experienced this in most ICU's of the hospitals to prevent the frequency of the signals to interfere with the frequencies of the medical machines.
This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated.
The  frequency of the transmitter is around 900MHz.The  coil L1 picks up these oscillations by induction and feds it to the base of Q1.

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 may not display this or other websites correctly.You should upgrade or use an alternative browser.
They still managed to make calls by finding a large metallic bucket then making call while inside this bucket.
Implant some form of metal sheets inside the wall while building, and it stops any communication signal from reaching inside the room or going out.
When a silisium diode is used the circuit also works but the detecting area becomes very very narrow. This makes the transistor Q1 activated.Since the Collector of Q1 is connected to the pin 2 of IC1 (NE555) , the IC1 is triggered to make the LED connected at  its output pin (pin 3) to blink. 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. CDMA involves spread spectrum and it's very difficult to interfere with a CDMA signal.
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. GSM is based on time division, and hence it should be no problem to try to jam it using random noise.

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