Diodes

Diodes are electronic components widely used in electronic circuits. They are responsible for allowing the passage of electric current in only one direction and blocking the passage in the opposite direction.

The diode is composed of a semiconductor material, usually silicon or germanium, and has two layers: a P-type layer and an N-type layer. The P-type layer is called the anode and the N-type layer is called the cathode.

When a positive voltage is applied to the anode with respect to the cathode, the P-type layer becomes more positive and the N-type layer becomes more negative. This causes electrons to move from the N-type shell to the P-type shell, creating a negatively charged region in the P-type shell and a positively charged region in the N-type layer. This positively charged region is called the potential barrier.

With the potential barrier created, the electrons that try to pass from the P-type layer to the N-type layer are blocked. However, if the voltage applied to the diode is inverse, that is, if the voltage is applied to the cathode with respect to the anode, the potential barrier increases and electric current cannot flow.

Diodes are widely used in rectifier circuits, which convert alternating current into direct current. They are also used in protection circuits, such as in power supplies, where they are used to protect components against polarity reversal.

There are several types of diodes, such as the Zener diode, which is used in voltage regulator circuits, and the Schottky diode, which is used in high-frequency circuits.

In summary, diodes are essential electronic components in electronic circuits, allowing the passage of electric current in only one direction and blocking the passage in the opposite direction. They are used in a wide variety of applications, from rectifier circuits to protection circuits and voltage regulators.

Next page of the Free Ebook:

7transistors

2 minutes