An amplifier is an appliance or device that is used to change or increase the amplitude of a signal. There is a relationship between input and output of an amplifier, which is expressed as a function of the input frequency called as transfer function and the magnitude of the output signal to the input is called as gain and is usually measured in decibels. These terms best suits the “electronic amplifier”. The unit of amplifier is expressed as voltage or current.
There are various applications of amplifier. In audio systems, amplifiers use loudspeakers to record human voice louder. Amplifiers can be further classified based on the amplification system used. For example, in an electric guitar, guitar amplifier is used, headphone amplifier, the frequency range amplifiers such as IF, RF, VHF, inverting amplifiers or non- inverting amplifiers or the device used as amplifier such as tube or valve or FET amplifiers. Transducer is a device that converts a signal to another. This can be called in other terms such as transformer or sensor.
There are many types of amplifiers namely electronic amplifiers which is used in radio, television, stereo systems etc. The power amplifier is an electronic amplifier, as the name suggests, it is related to the amount of power loaded or supplied. An operational amplifier also called as op-amp is used in many instruments and for signal processing.
The best way to choose an amplifier is, to check how powerful it is? First we need to determine the amount of power. Then, we need to decide how big it should be. The next step is to move to a shop and we should play an amplifier and check whether it works properly or not.
For example, when choosing a guitar amplifier, a guitarist has to practice by himself, about 15 to 30 Watts will be better. A guitarist who plays in a band needs at least 60 to 75 Watts of power. Next step is to choose, how large it should be? Generally amplifiers are categorized into two configurations namely Combo and Stacks. A combo amp is a combination of an amplifier and a speaker which is compact and portable. A stack amp is used to choose which works better. The stacks are classified into two types namely half stack and full stacks. In the former, a speaker cabinet combines with a head and in the latter, two speaker cabinets are used.
The difference between half and full stacks is that, in the former, there are four small speakers in the cabinet and in the latter, there are four speakers with a large speaker in another cabinet. This large speaker is used to record the low frequency notes. The third step is to research on what all features an amplifier should have. Some amplifiers come with digital effects built in. The fourth step is to bring your guitar to the shop and choose appropriate amplifier which best suits your guitar. The need to bring your guitar is to ensure that the sound is clear and it fits all our features. The last but not least is to allot the budget.
TheOp Amps are costlier and while choosing a car amplifier, first we need to allot a budget. Then, the next step is to take the user manual of your car or visit the website of the car manufacturer to know the best suited accessories. Then we need to look out for a good bass sound. Choose an Op Amps which has got low pass filter which filters low frequency sound in order to avoid distortion. This will also help to improve the quality of the sound from the stereo system. So, choosing an amplifier for any purpose is not an easy regard and at the same time it is also important to buy a suitable amp which best fits all your needs.