How to Build a Super Sensitive EMF Meter

Magnetic fields are produced by electronics, such as cellphones.

Magnetic fields are produced by electrical equipment, such as microwaves, televisions and refrigerators. They can also be found in cellphones and radios. According to Science Buddies, magnetic fields can be produced by a permanent magnet or by electrical current. The device that measures electromagnetic fields is called an EMF meter. You can build a sensitive EMF meter using materials from your electronic supply store. The strength of the magnetic fields are measured in Gauss, and EMF testers are also called Gaussmeters.

Things You'll Need

• Digital voltmeter
• Hall effect device
• Breadboard
• Wiring kit
• 5-volt voltage regulator
• 9-volt battery connector
• 9-volt battery
• 2 rubber bands=

Instructions

1. Attach the 5-volt regulator pins to the upper left side of the breadboard, in positions 1, 2 and 3.

2. Connect the the 9-volt battery wire to pin No. 2 on the 5-volt voltage regulator.

3. Attach a green wire from pin No. 3 to pin No. 1 of the hall device.

4. Connect a black wire from Pin 2 of the voltage regulator to Pin 2 of the hall device.

5. Attach the red lead to Pin 3 and the black lead pin to pin No. 2.

6. Add a 9-volt battery to the battery connector and then connect it to the breadboard using two rubber bands.

Tips & Warnings

• Sensitive EMF meters are sometimes used by ghost hunters.

References

• Cool Magnet Man: Build Your Own Gaussmeter
• Ghost Gadgets: EMF Meters Explained
• Less EMF: Magnetic Pickup
• Science Buddies: Measure Your Magnetism