Amplifying signal with a Transistor?

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hi,

i building paper speaker driven digital output arduino, audio quiet. speaker quite small @ moment, 4ft in diameter eventually.

what want amplify signal can increase volume. when connected amp, speaker loud enough, since creating sound rapidly switching digital pin on , off (rather inputting audio), don't want use amp.

can make simple circuit make speaker louder? i've been researching last couple of days (assuming use transistor ) quite confused, , don't want mess without understanding circuit, since i'm worried damaging arduino.

any appreciated, or @ least pointer in right direction.

thanks,

ben.

maplins recommended transistor, bought them. don't entirely understand info on datasheet, dubious using (also looks requires 11 v input?? or 11v?):

http://www.taiwansemi.com/db/pictures/modules/pdt/pdt060207001/ts7800_a07.pdf


here schamatic want.   it's supposed solenoid, want.   you can delete diode speaker.

what's impedance , power rating speaker?   we can't know transistor or voltage use without knowing "driving".

a power amp has couple of advantages - (normally) has volume control, , (normally) filter-out dc component signal.   (dc speaker generates heat & wastes power without contributing sound, , can make speaker operate non-linearly.) 

quote
maplins recommended transistor...
that's not transistor...   it's voltage regulator... wrong part.


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