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How to boost signal voltage level to make it audible

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
 

davenn

Moderator
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
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
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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