In our design we are using an audio amplifier supporting output from 1W to 4W. To monitor if speaker is working or not we are planning to use current sensing devices. Kindly suggest us what would be the best approach for this.Note: Audio amplifier operating voltage : 3-5V, Speaker impedance 3-10 ohms(We planned to test different speakers supporting the wattage.
Nidhi P Shetty
What kind of amplifier is it? A class D amp?
If it is a class D amplifier my first thought is that you will not be able to place a device on the output to sense the current that would work with a switching signal. Then it will also possibly affect the class D amp's over current sensing.
My suggestion is to use a Class-D amp that outputs current and voltage sensed outputs as a serial data stream that a DSP can read and react to.
We have some of those.
Can you suggest any such DSP
I was talking about an amplifier not a DSP. This one may work for your application. It will have to be supplied by a minimum of 4.5V. It can feedback current and voltage data so you will know at all times how much power it is driving out. So have a look: