The inductor is rolled into a spiral conductor stores magnetic energy in a magnetic field.
Without this element, it is impossible to build any radio or radio on wired communication.
And the TV, to which many of us are so accustomed to, is inconceivable without the coil inductance.
You will need
- The wires of different sections, paper, glue, plastic cylinder, knife, scissors
The basis of the coil inductance - conductor. Around the conductor with current flowing through it is always a magnetic field. The strength of this field depends on the current in the conductor. Another way to strengthen the magnetic field - to collapse the conductor into a spiral. This is nothing more than a coil inductance. The smaller the diameter of the coil, the more it turns, the stronger the magnetic field generated by the coil. Radio amateurs are usually wound coils independently.
The inductance of the coil is called the ability to create a magnetic field. Measured inductance in Henry (H).
Coils inductance not produced in the form of standard parts withstandard characteristics, and produce a count for each device individually. Therefore, in the manufacture of coil you need to first of all take into account the characteristics of the input and output of your radio installation.
For VHF and shortwave oscillating circuits produce coils with a small number of turns and a thick wire. Some of these coils are not carcass.
For receiving and transmitting radio signals at medium andwavelengths used multiturn coil (single and multi). To produce a framework for these reels you'll need paper or plastic.
The number of turns of the coil when settingradios and other equipment necessary to select experimentally by changing the inductance of the coil. This can be done domatyvaniem and unwinding of coil turns, but this method is not entirely practical. Most often, the coil is placed inside of the sliding mandrel special magnetic materials. This can be alsifer (an alloy of aluminum, iron and silicon).
Magnetic cores concentrated magnetic fieldcoil than increase its inductance. At the same time you can reduce the number of turns of the coil, which causes a decrease in its size and dimensions of the radio.