output of the circuit shows visual indication of the sensed electromagnetic radiations, a multimeter can also be used in the place of LED. The coil L1 can be any telephone pickup coil or similar coil. Sensitivity of the circuit can be adjusted with the 50K variable resistor. the operating voltage of the circuit is 9V to 12V DC.  
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The figure below shows a project of a simple electromagnetic radiation detector or sensor circuit. It can be used to detect electromagnetic filed generated from different electronic objects. The circuit can be built with few components; heart of the circuit is a TL071 J-FET single op amp. LED at the output of the circuit shows visual indication of the sensed electromagnetic radiations, a multimeter can also be used in the place of LED.
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Simple Electromagnetic Radiation Detector Circuit Diagram