My friends, in this topic we are talking about a well-known device in the channel, which is the sufficient detector
The device consists of well-known sections, which is the first section, the transmission, which in turn consists of transmitting oscillators, where the first oscillator with the first coil sends an electromagnetic signal with the same frequency value that the second oscillator sends with the second coil, and here we control the signal through a capacitor or several variable capacitors on the coil First and second, this method consists of a transistor number (2), a 104 capacitor (8), a 220 micron capacitor, and a 10k ohm resistor (4). Here, two coils on transistors are connected in the transmit circuit, and they are combined by a third transistor, which is called a mixer, to send the uniform signal that it has to amplify. 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.
It is a metal detector consisting of a simple transmitter of 2 npn transistors and two transistor capacitors of 100nm each, with four 10k ohm resistors.
Transistors work when connected to power, and when there is a coil on each transistor, we have two identical frequencies and the same value, provided we put two coils of equal diameter and number of turns, and when the metal approaches any coil, the frequency changes.
When changing the frequency of one of the files, there is a difference between the two frequencies with a certain value that does not exceed 7 kHz in most cases, which is an audio value or a frequency within the audible audio frequency, but it is not possible. It is heard before going through the stages of amplification of this sound frequency.
The receiver: The receiver here consists of three transistors in series with several resistors and capacitors, and it is a simple way to amplify the signal with three transistors, and we must not forget here to mention that this simple device is one of the BFO metal detectors.
Now we have an experience with this metal detector, and our depth is one and a half meters, according to a file of 60 * 60 square.
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