Peace be upon you, my dear friends. Today we are talking about a 4-transistor metal detection circuit. As you know, any metal detector consists of a transmitting stage and a receiving stage. Place it in the detector box near the circuit.
The two oscillators emit the same frequency at the same time, and when the large coil approaches the metal, a frequency difference occurs between the large coil transmitter and the small coil transmitter.
Now the reception stage begins, which is a stage consisting of two transistors, one of which is called a mixer, so the outgoing frequency is amplified and transferred to the fourth and final transistor. Here we use a 4.5 volt battery, and here the positive wire of the battery is connected to the positive wire of the speaker, and the other wire of the battery is connected to the negative of the circuit, and at the same time the collector transistor is connected, the latter is connected to the second wire of the speaker and the circuit as a whole is connected to a 9 volt or 12 volt battery. Below you see an illustration of me connecting the circuit.
Transistors used
BC547
2n3904
C1815
You can use any of the previous transistors and it will work, God willing.
We want to remind you that the most important factors in the success of a metal detector is careful scrutiny and implementation of the electronic circuit. I do not hide from you that some people reviewed me and placed the blame on me because the device they made was not working, but after reviewing the data and the electronic circuit they made, it became clear that they had errors in implementing the electronic circuit, and when they modified it. Their mistakes, the circuit began to work very beautifully, and from here I call on everyone to pay attention during the implementation of the circuit and to work on checking for faults in the electronic parts before installing the circuit. There is more than one video on our channel in which we explain with these videos how to identify faults in the circuit and the possibility of repairing the faults.
Please watch the video of the experiment in the اصنع كاشف معادن
channel
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