Hi. I am currently making a ball robot (bb 8).I have fitted a speaker inside the ball. However, the volume was very low so i used pam 8403 amplifier. The volume has increased than before, but still its not that audible from outside. So i need a better amplifier. Can anyone suggest me better amplifier than pam 8403?
[u]TI[/u] makes lots of power amp chips. For more power, you'll also need more voltage. I assume you have more voltage available in your robot.)
You may need more voltage - Power is calculated* as V2/R. That's RMS voltage and with a "normal" (single-ended) amplifier you get a theoretical peak-to-peak voltage equal to the power supply. (In practice, you can't get the full power supply voltage swing.) The RMS voltage is about 0.35 x the peak-to-peak voltage.
So, with 5V and 4 Ohms you can get about 3/4ths of a Watt.
With a bridge design you double the voltage for 4 times the power, or about 3W. (The PAM appears to be a bridge amplifier.)
- That's one way to calculate power... The basic power formula is Current x Voltage. The other formulas can be derived using Ohm's Law.
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