How to boost signal voltage level to make it audible

[moonnightingale]

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

 

[moonnightingale]

Can some transistor or Op Amp can do this

 

[BobK]

It's called an audio amplifier. LM386 is the classic IC audio amplifier.

Bob

 

[moonnightingale]

Yes LM386 is an ideal but i am working in Pspice

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

 

[davenn]

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]

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

 

[BobK]

Now i have matched the impedance

How did you do that, if not with an amplifier?

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

It would be audible but not very loud is my guess. I calcuate that it is 50mW.

Bob

 

[moonnightingale]

I used this site
http://circuitcalculator.com/lcfilter.htm

and adjusted L and C in such a way that impedance comes to be around 8 and freq also remain in my desired range
my L= 2.5 mH
C= 70 uF

 

[(*steve*)]

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.