Introduction: EMF Detector Kit

Picture of EMF Detector Kit

This is my submission to the Kit Contest. This device will react to almost all EMF's depending on the strength of the field and the type of wire used for the inductor. this will detect lightning, some radio frequencies, the field around the human body, the field mde by rubbing PVC pipe on cotton cloth and the Electrostatic field around Tesla Coils. (dont shock this project with lightning, Tesla coils or static because it will destroy the transistors)

Step 1: Parts and Tools

     2N 3904 NPN transistors X4
     2N 3906 PNP transistor X1
     connecting wire (if you make it on a solderless breadboard)
     8-Ohm speaker
     a 5V-9V power supply that connects to a wall adapter!!! this is very important!!!
     a breadboard (soldered or otherwise)
     a coil of magnet wire (dimensions don't really matter. the size only affects amount of interference they receive)
     Soldering iron
     wire cutters/strippers 

Step 2: Schematic

Picture of Schematic

Step 3: Kit on at Breadboard

Picture of Kit on at Breadboard

This is the alterable form of this project. if you wish to leave it at this to allow for changes, by all means, do so. if you want a more permanent form, please continue.

Step 4: Finished Board

Picture of Finished Board

Step 5: Finished Product

Picture of Finished Product

I will most likely add a decal to the PVC pipe.


Whoost (author)2015-04-06

Excellent! This is a quick easy look in to darlington pairs. Also, You can use any NPN and PNP Si transistors to do it. I'm definitely going to experiment with this design more. Thanks!

mfredrick (author)2013-10-25

Nice but one question.. What is the range of the sensitivity?

transistorguy (author)2012-05-23

I like your bio. I'm same way.
Tesla is the best.

I think I'm going to give this circuit a try, but why does it need to be attached to a wall adapter? Is a 9v battery not enough?

toast5678 (author)transistorguy2012-05-27

no, it will work with a 9v battery, but it will only be sensitive to high-energy EMF's such as those from a Tesla Coil. If you plug it into a 9v wall adapter you will receive much more interference (which can be tuned out) but will be more sensitive to low-energy EMF's. The voltage drain is minimal though, if that is what you were asking. also, i'm glad we share the same views on Tesla.

About This Instructable




Bio: I'm a 18 year-old guy who loves tinkering with and building electronics. I am self taught (in terms of electricity), my grandpa was an ... More »
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