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How to boost signal voltage level to make it audible

moonnightingale

Oct 4, 2011
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I am having a signal of 240 mvolts Peak to peak and freq of that sine wave is around 300 Hz

I want to amplify this signal so that it can be heard on 8 Ohm 1/4 watt speaker

Kindly tell me the circuitary to boost it

Thanks
 

BobK

Jan 5, 2010
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It's called an audio amplifier. LM386 is the classic IC audio amplifier.

Bob
 

moonnightingale

Oct 4, 2011
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Yes LM386 is an ideal but i am working in Pspice

Lm386 is not in library of Pspice
What can be other option
 

davenn

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Sep 5, 2009
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Yes LM386 is an ideal but i am working in Pspice

Lm386 is not in library of Pspice
What can be other option

Options....
1) add it to pspice that chip has been around for many years

2) forget about pspice and just build the circuit its not very difficult!!! very small component count

Dave
 

moonnightingale

Oct 4, 2011
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Now i have matched the impedance

will i be able to listen 1.8 V Peak to Peak sine wave on 8 Ohm 1/4 Watt Speaker
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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That will be better, but remember that when you load something with roughly an 8 ohm output impedance with a load of roughly 8 ohms, the voltage across the output will fall to roughly half of what it was.

So don't be surprised when this happens.

If you have multiple stages of filter the situation will be worse since each stage loads the previous one.
 
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