well i ve made some measurments on the output ... it s going between 0.3 V and 3 V so when dividing by 2.828 i would get betwenn 0.11 and 1.1 ... when squaring it would be 0.01 and 1.21 ... when dividing by 8( speaker impedance ) it would be 0.00125 and 0.126 W RMS ??? is that possible ???
so i dunno if i m making false mathematics here.. but all i want to know is that when i m using like u said a 8 ohm speaker ... with a battery of 12 V and a sinusoidal sound on the output with high frequency ( about 3 to 10 Khz) i want that the intensity do not cross the 0.5 A on the power input ( the battery ) what is the maximum power of the amplifier that i can use ???? i mean which amplifier can i use for this maximum ??