Could any one please suggest a suitable audio preamplifier and audio power amp to successfully drive a 0.2 W speaker

 

Are you looking for chips or are you looking for system components?
Speakers are normally specifed in terms of their impedance. What is the purpose of specifying a power level? Is it an average, a max, what??

 

What is the power source to run it?

Size requirements for design?

 

The power level is a max, the impedance is 8 (Ohms) and the power source is 3V. Either chips or system components would be fine, thanks.

 

the size should be as small as possible.

 

The power level is a max, the impedance is 8 (Ohms) and the power source is 3V. Either chips or system components would be fine, thanks.

So if I take SQRT(.2 Watts / 8 Ohms) ≈ 158 mA which leads to an RMS voltage of 1.26 volts

I don't know if the IC amplifiers like an LM386 will work at such a low VCC as that. Perhaps there is an alternate IC that will do the job. If not one or two transistor stages may also do the job, but with such a low single supply system you will need to do a very careful design to avoid crossover distortion, saturation, and clipping. It may be beyond my capabilities.

BTW what is the input signal level?

 

do you think a TS4962M would be suitable for this purpose and if yes in addition to this do i require a preamp?