05-10-2017, 10:56 AM
The rapid growth of cell phones in the 21st century so far has posed many problems. In addition, public reaction was growing against the disturbance of cell phones introduced into everyday life. Here is a simple engineering project, ie hidden active cell phone detector. The pocket cell phone detector can detect the hidden active cell phone. So this project is used to neglect the use of cell phones in examination rooms, private rooms, defense establishments, hospitals, military camp, gas pumps and also very useful to detect the use of mobile phones for espionage and other correlated activities . This circuit can detect calls, SMS, video transmission even when the cell phone is hidden in silent mode. The warning bug detects the radio frequency (RF) transmission signal of a cell phone, it generates a beep sound alarm.
Hidden Active Cell Phone Detector Circuit
The transmission frequency of cell phones ranges from 0.9Hz -3GHz with a wavelength of 3.3cm -10cm. The RF signals can be collected from the cell phone along with the disk capacitor and the cables acting as a small gigahertz loop antenna. When the cell phone is activated, it transfers the signal into sinusoidal waveform that allows through the space. The circuit diagram of the hidden active cell phone detector is constructed with operational amplifier, monostable multivibrator and piezo buzzer.
Hidden Active Cell Phone Detector Circuit
The transmission frequency of cell phones ranges from 0.9Hz -3GHz with a wavelength of 3.3cm -10cm. The RF signals can be collected from the cell phone along with the disk capacitor and the cables acting as a small gigahertz loop antenna. When the cell phone is activated, it transfers the signal into sinusoidal waveform that allows through the space. The circuit diagram of the hidden active cell phone detector is constructed with operational amplifier, monostable multivibrator and piezo buzzer.