CA3130 | Electronic Project Circuits

Posts Tagged ‘CA3130’

Mobile Bug Detector using CA3130

This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one-and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorised video transmission. 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.

The moment the bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. An ordinary RF detector using tuned LC circuits is not suitable for detecting signals in the GHz frequency band used in mobile phones. The transmission frequency of mobile phones ranges from 0.9 to 3 GHz with a wavelength of 3.3 to 10 cm. So a circuit detecting gigahertz signals is required for a mobile bug.

Here the circuit uses a 0.22µF disk capacitor (C3) to capture the RF signals from the mobile phone. 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. The disk capacitor along with the leads acts as a small gigahertz loop antenna to collect 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.

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. The output CMOS transistor is capable of swinging the output voltage to within 10 mV of either supply voltage terminal. Capacitor C3 in conjunction with the lead inductance acts as a transmission line that intercepts the signals from the mobile phone. This capacitor creates a field, stores energy and transfers the stored energy in the form of minute current to the inputs of IC1.
This will upset the balanced input of IC1 and convert the current into the corresponding output voltage. Capacitor C4 along with high-value resistor R1 keeps the non-inverting input stable for easy swing of the output to high state. Resistor R2 provides the discharge path for capacitor C4. Feedback resistor R3 makes the inverting input high when the output becomes high. Capacitor C5 (47pF) is connected across ‘strobe’ (pin and ‘null’ inputs (pin 1) of IC1 for phase compensation and gain control to optimize the frequency response.

When the mobile phone 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. This triggers monostable timer IC2 through capacitor C7. Capacitor C6 maintains the base bias of transistor T1 for fast switching action. The low-value timing components R6 and C9 produce very short time delay to avoid audio nuisance. Assemble the circuit on a general-purpose PCB as compact as possible and enclose in a small box like junk mobile case.

As mentioned earlier, capacitor C3 should have a lead length of 18 mm with lead spacing of 8 mm. Carefully solder the capacitor in standing position with equal spacing of the leads. The response can be optimized by trimming the lead length of C3 for the desired frequency. You may use a short telescopic type antenna. Use the miniature 12V battery of a remote control and a small buzzer to make the gadget pocket-size. The unit will give the warning indication if someone uses mobile phone within a radius of 1.5 meters.
Author: D. Mohan Kumar – Copyright: EFY Magazine
Source: http://www.extremecircuits.net/

Light Change Detector by IC CA3130

Circuit Light Change Detector by IC CA3130
This the Secretariat of the Swith light high-quality circuit. By prominent its point is when the light changes the system will order to give Relay work immediately. Detect the change in the light that get from the circuit is will that. We use IC op-amp number CA3130 work the circuit compares with that have tall many rapidity. For detect the light use LDR then economize and be usable good easy. The S1 be The Secretariat of the oval Senate staggers new system. When the circuit has worrked already. The detail requests a friend sees to add in the circuit please sir.
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Peak Reading VU Meter by IC CA3130

Circuit Peak Reading VU Meter by CA3130
When build power Amplifier Circuit finished already. Many you might something Peak Reading VU Meter circuits. I begs for to advise this circuit , be one your choice. By it uses IC CA310 , make have high sensitive , show with Current Meter. Get comfortable besides this circuit still use the a little equipment and build easy as well. For VR1 use for fine decorate the sensitive of this. Give can signal sound temple , very low volt , get sir. Detail other part please see in like model the circuit is sir. Read More