Thursday, 8 October 2020

Electronic amplifiers


Electronic amplifiers, we use the word amplifier when referring to the components of a stereo sound system or musical instruments. But amplifiers do exist and a lot of devices like TV speakers, computer speakers, and CD players. In fact, amplifiers are used with every device connected to a headphone to produce sound.


In this article on how things work, we will explain the basic principle of making amplifiers and get to know its main parts. Despite their diversity between simple and complex, the idea of ​​their work is the same.


We know, dear readers, that sound is a physical phenomenon that depends on the vibration of air molecules to affect the surrounding environment in the form of a disturbance that spreads rapidly through the middle, and when these strikes reach the eardrum, it forms pressure on the eardrum membrane in the form of pulses, and the dinner vibrates in the same way and these vibrations are converted into signals Electrocardiograms are found in the rest of the ear and sent to the brain to be translated into the sound we hear.


Electronic devices that produce the sound of various kinds work in the same way and are similar to the same way as the ear, as they deal with the sound as information in the form of variable electrical signals. To understand how electronic devices deal with sound, we will explain this through the following three stages:


First the microphone:

When a sound is produced in front of the device's microphone, the thin film in the microphone produces vibrations with the same frequency as the sound, these mechanical vibrations are converted into electrical signals. Through their frequency, the electrical signals carry information about the mechanical compressions and distortions they cause.


Secondly, the recorder:

The device converts the electrical signals into coded signals in some way to be saved either on a magnetic tape in the form of changes in the magnetic regions on the tape or in the form of thin mechanical streaks as in old cylinders or in the form of streaks by a laser beam, as in CD


Third, the operator:

Electronic amplifiers The operator of all kinds, as each method of preserving the sound, has a special operator for that, such as a recorder, a CD player, or otherwise, to translate the code (whether magnetic, mechanical, or optical) and convert it into an electrical signal. This electrical signal is used to move the speaker back and forth to cause disturbances in the air. We hear it in the form of a sound similar to the sound that came to the microphone.


The idea of ​​working the amplifier (amplifier)

From the above, we can understand that the function of the amplifier is to strengthen the (electrical) audio signal so that it can have the ability to move the speaker membrane. In short, this is the work of the magnifier, but if we want to know how this process takes place, we have to take a tour inside the magnifier to get to know its components.


In fact, the amplifier generates a new signal completely different from the original signal that entered it but on the basis of the original signal. To understand this, imagine that there are two separate circuits inside the amplifier. As the output circuit works by the power supply of the amplifier, which gets its power through a battery or by connecting it to the power socket in the house.


If the amplifier works through the house's electricity with alternating current, where the current changes its direction constantly, then the power supply will work to convert this alternating current into a constant current where the direction of the current is always the same and does not change. After this stage, the current produced in the actuating circuit is used to move the speaker cone to make the sound.

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