In this tutorial, we are demonstrating a project on a Mobile Phone Detector. The mobile phone detectors are generally pocket-size versatile transmission detectors. It can detect the presence of an activated mobile phone.
This is a project of a sensitive mobile phone detector circuit using a CA3140 Op-Amp IC, a 555 timer IC, and barely any other discrete segments. The circuit can detect a cell phone from 8 to 10 meters away or more, you will find a different range with various brands of cell phones. This is one of the easiest circuits for making such a responsive mobile phone detector.
Hardware Components
The following components are required to make a Phone Detector Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1 | IC | CA3140 | 1 |
| 2 | IC | NE555 Timer | 1 |
| 3 | Transistor | 2N3904 | 1 |
| 4 | Diode | 1N34 | 2 |
| 5 | Antenna | 3.5-inch | 1 |
| 6 | Piezo Buzzer | – | 1 |
| 7 | LED | – | 1 |
| 8 | Resistor | 1M,10K, 1K, 470R | 2, 1, 1, 1 |
| 9 | Battery | 6 – 12V DC | 1 |
NE555 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer
CA3140 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of CA3140
Phone Detector Circuit
Working Explanation
In this section, we discuss the operation of the mobile phone detector circuit. In this circuit, there are two ICs, the IC1 is functioning as a signal amplifier and the IC2 is working as a time delay. At the point when any mobile phone signal is received, the 555 timer IC will become activated and actuate an LED and a piezo buzzer for a few seconds.
However, the circuit is likewise utilized for some other reasons as well, it tends to be utilized in places where the mobile phone doesn’t allow it. For example, at examination halls. It can likewise be utilized to locate a lost mobile phone regardless of whether the mobile phone is set to vibration alert or on a low-volume ringtone. The working voltage of the circuit is 6V to 12V DC. You can likewise utilize any small-size batteries with the circuit.
Applications and Uses
The mobile detector is utilized to detect lost mobile phones and at places where mobile phones are not allowed like examination halls, meetings, etc.
