Mobile Scanner. Start Up Project 35

2AKeep this Match box size Mobile Scanner in your pocket. It will Scan around you and beeps loudly when a Mobile phone turns active in your vicinity. It can detect the activation of Mobile phone around 2 Meters radius. It beeps during incoming call, outgoing call and when somebody tries to take your Photo. It is an ideal device to detect Mobile phone use in examinations halls, confidential rooms, hospitals etc where Mobile phone is strictly prohibited. Its range can be from 50 cm to 3 meters depending on the type of the active Mobile phone. With  Smart phones, its range is less than 1 meter because there is a mechanism in it to prevent excess radiation. But in ordinary Mobile phones, its range can be up to three meters. Try this nice weekend project.
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Trick to detect Electronic Smog

Electrons are invisible to human eye then how can we see the electronic smog existing in our home. Is there any method to see them? Impossible, the only method is to capture the energy from it to activate a circuit for giving a visual indication. When you sit in front of a computer or television, you are being bombarded by harmful waves quietly emanating from it. Even if you turn off the device, your biomagnetic field is still bombarded 24 hours a day, 7 days a week by the EM radiations from power cables, electric and electronic instruments etc. These radiations of different frequencies exist in our environment as Electronic Smog. Extremely low frequencies waves (ELF) exist wherever electricity flows and radiate it from every electrical item in your environment. Let us try this circuit to give a visual indication of the electronic smog.

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Mobile Detector

This is my most popular circuit published in Electronics For You.This Mobile Bug detects an active mobile phone from a distance of 2 meters radius even in the silent mode.It detects incoming calls,outgoing calls,SMS,MMS,Video recording etc.It beeps at the moment it detects a mobile phone activity.It is an ideal device to check unauthorized use of mobile phones in restricted areas such as Confidential rooms, examination hall etc.Full article in PDF.