Make a metal detector with a detailed explanation of a depth of 3 meters

Dear brothers, this device is of great importance, as it is rare to find a metal detector that is so easy to manufacture, and we get this depth. Therefore, the information contained here is of value that is not available on the rest of the websites, especially since we are the only ones who knocked on the door of this department and developed a lot in it.

This circuit consists of a group of resistors, capacitors, and transistors that are connected in a specific way so that they form a distinct metal detector, God willing:

transistor:

The transistor has types, and we will discuss here 3 main types of the transistor, but first we must know the main function of the transistor, which is summarized as follows:

1 - Act as an amplifier and amplifier for frequency and current

2 - Work as an oscillator under certain conditions, and it is connected to a file and a capacitor to control the value of the outgoing frequency

3 - Work as a switch to turn on and off the circuit.

Types transistors and their operating voltage:

1 - The npn transistor, and we distinguish it through the arrow drawn on the symbol, and the arrow is to the outside, and the operating voltage of this type must be at least 0.7 volts on the base of the transistor.

2- The transistor is of pnp type and we distinguish it

Fourth: AISI IC We learn here the benefits of AISI, which we can summarize in enlarging, generating and cleaning the signal, as well as using AISI in programming.