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audio amplifiers


karthikeid
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Feeding the speaker 30W instead of 60W will result in a small loss of volume.
You probably will not notice the very small difference in volume between 30W and 20W.

Your hearing's response to loudness is logarithmic:
1) 6W sounds half as loud as 60W.
2) 600W sounds twice as loud as 60W.

You never play music at full power all the time. The average amount of power is about 1/10th the maximum.

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hi
here is an datasheet of an ic from ti, can u help me to put a volume controller to this circuit and what is meant by 4step gain control, multiple class d devices, shut down and mute control.... ???
what should be the input voltage and current?

http://focus.ti.com/docs/prod/folders/print/tpa3100d2.html#samples

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The TPA3100d2 has many tiny pins that would be very difficult to solder.
Adding a heatsink would also be very difficult.

The sales sheet is wrong. It says that the output per channel is 20W into 8 ohms with a 12V supply but the datasheet shows only 7.5W to 10W per channel.
It produces 10W per channel (2 channels) at a horrible-sounding 10% distortion when its supply is 12V and its speakers are 8 ohms. It produces only 7.5W per channel at 1% distortion.

It produces 20W per channel (2 channels) at a horrible-sounding 10% distortion when its supply is 12V and its speakers are 4 ohms. It produces 15W per channel at 1% distortion.
But with 4 ohm speakers it gets very hot because is is so small.

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what must be the input current for this amplifier??
2amps is ok??

You must say what is your speaker's impedance and how much output power you want.

The LM3886 can produce 68W into 4 ohms with a plus and minus 28V supply. It dissipates about 42W so its total power is 110W and the current in the 56V supply is 2A.

The LM3886 can produce 50W into 8 ohms with a plus and minus 35V supply. It dissipates about 
30W so its total power is 80W and the current in the 70V supply is 1.14A. 
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I don't know why people use class-A audio amps. They waste a very high amount of power by getting hot especially when they are not playing.
Some "odd" people add a class-A load to the output of an OPA034 opamp to "reduce" its 0.00008% distortion. They are crazy since 0.05% or less distortion cannot be heard and speakers have much more distortion.

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