ELECTROMAGNETIC FIELD (EMF) DETECTOR WITH LM358

Original Source: http://www.instructables.com/id/Electromagnetic-Field-EMF-Detector-With-LM358/

Parts List:

• 1x - EMF detector PCB (or you can use perfboard)
• 1x - 9V battery clip (6f22)
• 1x - stereo audio jack 3.5 mm
• 1x - LM358 - or any other pin compatibile dual opamp (TL072 works fine)
• 2x - 100mH radial inductor (may be labeled as 104J)
• 1x - LED (whatever color/parameters)
• 1x - potentiometer 500kΩ stereo linear
• 1x - 1N4148 or any other general purpose diode
• 3x - 1kΩ resistor
• 2x - 10kΩ resistor
• 2x - 100kΩ resistor
• 2x - 100µF electrolytic capacitor (any voltage rating)
• 4x - 2.2µF electrolytic capacitor (any voltage rating)
• 1x - SPDT switch if you want
• 1x - 8 pin socket if you want