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 circuit is useful to detect microwave (gigahertz signal) sources like microwave oven, satellite communication devices, Mobile phones etc. If an inductor coil with a parallel capacitor is placed in the path of EM radiation, the capacitor stores electrical energy and inductor stores energy in the magnetic field induced by the coil windings.
Since the voltage generated by the sensor assembly is too weak, a differential amplifier (IC1) is used to amplify the signal.CA 3130 (IC1) is designed as a differential amplifier with balanced inputs set by R1 and the sensor assembly. CA 3130 ( IC1) is a CMOS version high speed switching Operational amplifier with gate protected p- channel MOSFET transistors in the inputs.

When the bursts of microwave impinge on the Loop aerial (L1, it pickup the energy from the radiation and transfer it to the inductor coil (L2) This creates an alternating current in the inductor which passes to the inputs of IC1 through C1 and D1.
Signal diodes D1 and D2 (BAT 43 Shottky Diodes) directs the induced current into the inputs of IC1 and the capacitor C3 provides suitable stabilization of the non inverting input of IC1.
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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. The pickup coil is directly coupled to the inverting and non inverting inputs of IC1, so that a minute current in the pickup coil can generate a potential difference across the inputs of IC1 and its output switches high. How the soil moisture sensor knows soil is wet or dry Hi orbital introduced in the mobile blockers that only have a chair surrounded. 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.
VR is provided for the offset adjustment and bias the internal circuitry of the IC1, so that its output is ordinarily held low. 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. The circuit exploits a few simple scientific facts about EM radiations and Magnetic induction.
A pickup coil (L2) with a capacitor (C2) forms the signal detector which resonates in response to the microwave radiation and generates a minute voltage (around 2 milli volts) along the signal diodes D1 and D2. When there is a microwave radiation near the sensor coil, it generates a current that upsets the balance in the inputs of IC1 and its output switches high to drive the switching transistor T1.
In the schematic universal-triac-control-with-optocoupler, the PNP transistor 2SB328 is shown as NPN. Electromagnetic radiation has both electrical and magnetic field components which oscillate in phase perpendicular to each other to the direction of energy propagation.
The circuit is immune to other forms of RF radiations but can detect the Giga Hertz signals from an active mobile phone.

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