This device is excellent, and I recommend making it. We have tried it many, many times. Thank God, we were able to accomplish our first metal detector. Here we publish the composition of this device.
Today we are talking about a distinctive metal detector, which we
talked about earlier. It is a sufficient detector. This distinctive device is summarized in its work as follows:
The transmission takes place from the transmitter, which in turn consists of two transistors for transmission, where the first transistor with the first coil sends a frequency of the same value as the signal that the second transistor sends with the second coil, and here we can control the signal through a variable capacitor or two variable capacitors on the first coil or on both the first coils The second, and this method consists of a transistor number (2), a capacitor 104 number (8), a capacitor of 220 microns, and a resistance of 10 kOhm number (4). Here, two coils are connected on the two transistors in the transmitter circuit, and they are united by the third transistor, which is called the synthesizer, to send the unified signal to it To the amplification, and here we control the signal through a variable capacitor or two variable capacitors on the first coil or on both the first and second coils.
The receiver: The receiver here consists of three consecutive transistors with several resistors and capacitors. It is a simple way to amplify the signal with three transistors. We should not forget here to mention that this simple device is a metal detector of the type bfo.
It is not possible for us to know the characteristics of the device until after its manufacture and testing on the ground. Here, in this experiment, the device was tested with a circular coil of 30 cm in diameter, the number of its coils being 7 coils, and the maximum depth of this coil is 75 cm.
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