Converting the radio into a 30 cm depth metal detector

 Let's talk today about the beginning of making a metal detector depth of meters from scratch (the beginning) and distinguishing metals in the device according to the dedication of the files and the required modification on the device

This video that we have today is an explanation of a series in which we talk about the beginning of manufacturing from scratch, which is the stage of learning to the stage of the beginning of manufacturing, and then we will continue, God willing, to the stage of mastery.

We will learn, God willing:

First, the variable resistance: it is an electrical resistance to the electric current or voltage. You can control its value up and down.

Secondly, the fixed resistance: it is an electrical resistance with a fixed value and its value is known through the colors on the resistance visually.

Second: Capacitors:

Capacitors have many types, some are fixed, some are movable, some are polar, some are non-polarity, and others can withstand a certain voltage limit, so let's know a little bit about them.

Variable value capacitors: for example variable capacitors in radio to change stations (radio tuner) and here we can control the value of the capacitor as we want.

Fixed capacitors without polarity: These capacitors have certain values ​​that we cannot change. Here, even if we change the legs of the capacitor, it doesn't matter. It is nonpolar and works correctly either way. But how do we read the capacitor and here we say that most capacitors have a capacitive value written on its side, but there are minor changes that are common and the most suitable capacitor is chosen from the available data written on the surface of the capacitor, or from the data that its manufacturers may provide.

Third:

transistor:

Transistor has different types and here we will discuss 3 main types of transistor but first we should know the main function of transistor and they are summarized as follows:

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

2 - It works as an oscillator under certain conditions and is connected to a coil and a capacitor to control the value of the outgoing frequency

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

Types of transistors and their operating voltage:

1 - The npn transistor is marked with an arrow drawn on the symbol, the arrow is out, and the operating voltage of this type must not be less than 0.7 V on the base of the transistor.

2- pnp transistor and distinguish it

Fourth: IC, and here we learn about the benefits of IC, which we can summarize in signal amplification, generation and cleaning, as well as the use of AISI in programming.

The real and important beginning, after learning the previous lessons, we start from this subject. After watching the video, we will begin, God willing, to start moving towards craftsmanship and mastery. After watching the video below, you must ask about the specialized and large file to give us a depth of 3 meters, and from here we add a comprehensive picture, God willing, to this file:

Details to reach the best depth:

We do not miss here to mention that the device needs two files, one of which is the large file and we mentioned its details. As for the small file, you will find its details in this video

The following pictures give us a comprehensive view, God willing

Or we can make the amplifier from just one extra transistor

And we can use any zoom circle and it can fulfill the purpose, God willing

Now the video of the device, and we wish you an interesting and useful follow-up:

Please watch the video of the experiment in the اصنع كاشف معادن 

channel

Before concluding, my dear brothers, I would like to attach to you a picture to indicate the location of linking the two files, as I was asked about the subject a lot, although it is clear in the previous picture