In this Instructable I will show you how to create a very simple, low cost metal detector. This is not the type of large scale metal detector you can use on the beach however; this can be used for finding where two studs in your walls meet (aka locating the nails), a lost screw, screws, or just simply fooling around testing different objects around the house.
-a 9 volt battery
-9 volt battery connector
-a LED (any color)
- a resistor 100 ohm -/+5% color bands are: brown, black, brown (needed for the 1.5v LED)
-and of course a metal sensor. I got mine from SunX.com, but you can try a number of different robot part sites or electronic components suppliers. try and get one with a LED built in that way you can see if the metal detector works when it touches metal.
OK lets get started!
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Step 1: The Circuit
The circuit is very simple. For assembly please follow the provided circuit diagram. Remember that the LED and metal Detector are polarity sensitive. I ask you strongly to test each component before soldering them all together.
Step 2: Test
the LED is simply to let you know there is power going to the metal detector.
A video of the metal detector in action