gain amplifier circuit

Thread Starter

omar675

Joined Apr 5, 2018
5
hello
i need a diagram for a circuit that amplifies sound and speech
it is supposed to give out a constant output whatever the input is
(ex. if i speak in a low voice the circuit is supposed to increase the gain and give it as the output and if i speak in loud voice it is supposed to reduce the gain and give it as the output)
i looked it up and it is called a gain amplifier or a pre-amp circuit but i couldn't find what i was looking for
any help would be appreciated
thanks in advance
 

Thread Starter

omar675

Joined Apr 5, 2018
5
Ok so i got the circuit and i tried to simulate it using orcad cadence
I know iam supposed to get the same gain using different voltage input
I used sin voltage source and frequency from 1 to 1000
I probably messed up somewhere
What values should i put exactly if i did it wrong?
 

MisterBill2

Joined Jan 23, 2018
18,176
Really, the circuit is called a compressor, or a speech compressor. A gain amplifier is simply an amplifier. The concept of a speech compressor is that as the input increases the gain is reduced just enough to keep the output constant. But be careful because there are also limiter circuits that simply limit the amplitude by clipping it, which causes a lot of distortion. Unfortunately some folks call the limiters compressors, an incorrect label.
 
Top