Quote from: joecool85 on April 08, 2006, 08:30:05 PM
Looks like earlier when I had posted stuff saying about 60v for input on the lm3886, I was right, but not for the way the chipamp is setup. We only need 1vRMS if I'm correct.
Sort of. The typical supply voltage for the chip is about 60V when the negative rail is used as the reference: That´s +- 30V per rail when referenced to the ground. However, the chip's input sensitivity, which is a whole another thing, is totally dependant on the circuit's gain set. Now if i remember right, the LM3886 required at least a gain of 20 to operate stabile. With a one volt that should equal 20 V on output, which gives 100W of power to 4 ohm load - way more than LM3886 can even handle. If you have a notably lower input signal amplitude just raise the gain. This is easy since the chip basically operates just like a high power opamp. I think there is a limit for the maximum gain too (as there is such for opamps as well), which is the point where the chip starts to operate unstabile. Let's just say that i wouldn't go higher than a gain of 100 for example. These two factors limit the input sensitivity to a sensible range. I'd say something from 400mV to 1V should be good.