Do amplifiers work with AC signals?

@zaveri-5TD6Sk • Oct 22, 2024

Oct 22, 2024

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i just have one basic question about amplifiers. do they work for A.C signals as well.

now supposing an A.C current has to be amplified leaving the voltage unchanged, then what should be the power input to the amplifier ?

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Jeffrey Arulraj

@jeffrey-xA7lUP • Jan 2, 2013

Hey my friend AC signal can be amplified by the amplifier using an external DC source

You can amplify the current of a signal maintaining the voltage using either emitter follower or source follower

Do post the current rating you need and your input we can help you more in identifying the solution
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Ramani Aswath

@ramani-VR4O43 • Jan 2, 2013

zaveri
now supposing an A.C current has to be amplified leaving the voltage unchanged, then what should be the power input to the amplifier ?
That is what an audio amp does.
<a href="https://www.bcae1.com/hcvsnohc.htm" target="_blank" rel="nofollow noopener noreferrer">High Current Amplifiers</a>

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pratap singh, upendra

@pratap-singh-6xlmve • Jan 2, 2013

yes an amplifier definitely works with an ac signal.

now coming back to whether it can amplify a current or not, let me tell you that there exists a class of amplifiers termed as current controlled current source. This means that if the amplifiers are pictured as a two port network(one input port and one output port) then such an amplifier takes current signal and produces its amplified version in the same dimensional domain(i.e the output is still a current).

remember biasing of the amplifiers is done to merely make it "an active device". without biasing an amplifier remains only a piece of semiconductor with some electrical connections. It is the biasing that paves the way for transistor action to take place within it. The biasing does not govern the signals an amplifier can amplify, it however governs the way in which the amplifier will amplify the signal.
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