Making a metal detector for beginners depends on several things, the most important of which are:
1- That any person can make the circuit, even if he is not a specialist
2 - There are pieces everywhere
3- The distance that the metal can detect when it is far from it
On this basis, we recommend, God willing, the best devices that we have made in our channel and in this blog, based on the above:
The first circuit: It converts the radio into a metal detector using one NPN transistor with two capacitors No. 104 and a 220 micron capacitor in addition to a 10 kOhm resistor No. 2, where the transistor sends a frequency close to 100 kHz to the coil and the radio antenna and the radio negative are connected to both ends of the coil, Thus by balancing in the radio we can obtain the signal, and when the metal approaches the coil, a sound is emitted, which is the difference between the radio frequency and the frequency of the transistor transmitted in the circuit.
This circuit works best only with the following coil:
The second circuit is based on the previous reasons, and it is a simple circuit consisting of 4 transistors and parts that are available in old televisions, radios, and old devices, and they do not cost to be purchased. This circuit stops when the sound of the device is heard in the earphones, which are as follows:
As for the third circle, it is intended for friends who want to hear the sound big and not on earphones, and it is the same as the previous circle, but 2 transistors and several capacitors and resistors were added to it, as follows:
Dear friends, we can shorten the previous circuit in the fourth circuit, which is of high quality and was invented in the channel and we can use it.
It remains to say that the second, third, and fourth circuit in our topic reaches a depth of 3 meters if the circuit and coils are made of high quality:
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