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2. Half wave and full wave

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Q: How many types operational amplifier?
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What is the low frequency gain in operational amplifier?

low frequency gain will be 20log(Vo/Vin)


What is the difference between normal amplifier and operational amplifier?

To oversimplify it the "operational amplifier" was originally designed to perform mathematical operations in electronic analog computers. The designer set the mathematical operation of each amplifier by designing its feedback network. Some operations that could be done were: addition, subtraction, constant multiplication/division, logarithm, exponentiation, variable multiplication/division by combining logarithm-addition/subtraction-exponentiation, integration, differentiation, absolute value, clipping, etc.A "normal" amplifier was just designed to produce a certain amount of voltage or current gain.


What is amplifier and what is the general circuit of amplifier?

An amplifier amplifies voltage or current. The most basic amplifier consists of a transistor where a signal is fed into the base and is output to the emitter or collector. For simple, low frequency applications (not RF), it may be simpler to use an operational amplifier (op amp) than designing your own amplifier. Also, the data sheets provide very helpful schematics for creating an amplifier. A very common one is the 741; these are also fairly cheap.


Can operational amplifier be used to sum or more signals?

A: Sure by adding or subtracting from different inputs or scaling with different value of resistors


Why amplifier is called amplifier?

The root word "ample" means abundant, having lots of something, as in, we had ample food to eat at the feast. To amplify means to make something more ample. So when it comes to sounds, if you take a faint sound and make it louder, you are amplifying it. That is what an amplifier does.