Cell phone detector

Basic knowledge behind this project:

We all know about the Schotty diode which can detect the cell phone signsl, the frequency range of this signal is of 0.9 to 3 GHz. Schottky diodes have an unique property to rectify low frequency signals, with low noise rate.When an inductor is placed near any RF signal source, it receives the signal through mutual induction. This signal is rectified by the Schottky diode. we can amplify this signal then use to power any indicating LED.

Circuit Components:

• Battery = 12V
• L = 10uH
• R1 = 100Ohms
• C = 100nF
• R2 = 100K
• R3 = 3K
• Q1 = BC547
• R4 = 200 Ohms
• R5 = 100 Ohms
• IC1= LM339
• R6 = 10 Ohms
• LED = Blue LED

Applications:

1. We can use it at examination halls, meetings to detect presence of mobile phones and prevent the use of cell phones.
2. It can be used for detecting mobile phones used for spying and unauthorized transmission of audio and video.