Almost any multimeter can be quickly turned into a good metal detector. You can even implement such a project at home on the balcony using readily available and already at your disposal means. The entire transformation operation will take about 10-15 minutes, provided that everything you need has been prepared in advance.
What you need: scotch tape, plastic tube, multimeter, wire 0.3 mm enameled
How to do it?
First and foremost, we take a 0.3 mm enameled wire and make a coil from it for the future metal detector. The easiest way to do this is with a board and a couple of nails. We drive nails into the tree at a distance of one and a half palms from each other, after which we begin to wind the wire around them. We make 150 turns. We fix the winding.
We get rid of the contacts and wire from the enamel, after which we connect the probes of the multimeter to the coil. Actually, this makes an impromptu metal detector ready! You can "refine" the design by adding a comfortable hand made of a plastic pipe to the multimeter. We attach the multimeter itself to one end of it. On the other, there is a wire ring.
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Why does it work?
In order for the multimeter to work as a metal detector, you must use it in the diode continuity mode. In it, the device supplies alternating current to the probes, and since the coil has no polarity, resonance arises in it. As soon as a metal product appears next to the coil, its inductance changes, which in turn is noticed by the tester device. True, this design has a small drawback. To detect metal, the coil must not remain in place, as in this case the multimeter will always read zero.
Continuing the topic, read about how to find out, for what voltage the LED is designed.
Write in the comments what do you think about this?
Source: https://novate.ru/blogs/131120/56732/
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