Abstract
A cell phone detector is a device specifically designed to detect and locate the presence of a cell phone in a specific area. Cell phone detection has been studied for a long time. Techniques have been developed or proposed on how to detect cell phones. Most of them are trying to exploit features such as audio systems, RF systems, and common materials in phones and study how these can be used as the basis for cell phone detection. This study uses the cell phone's RF system as a function to detect the presence of a cell phone. Using relatively inexpensive and available electronic components, a circuit that detects signals in the 0.9 GHz to 3 GHz range is used to detect a mobile phone in use. The constructed cell phone detector can detect the presence of various activated cell phones within 1.5 meters around it and indicate this by flashing a light emitting diode (LED) connected to its output. Even if the cell phone is in silent mode. The circuit test results show that the cell phone detector works well.
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