Scaling LM386-x circuits

[mistahead]

I was bread boarding the Dual power king from Beavis pge on the LM386 page and was wondering...

http://www.beavisaudio.com/library/LM386/LM386.html

What sort changes would be required to use the larger -3 or -4 chips and scale voltage in these amps?

IC for noob question hehe

[WaveshapeIllusions]

Probably just a higher supply voltage, no real changes needed. The 386 chips are pretty similar as far as I know. Perhaps change the gain a bit. The page didn't load, so I'm not sure what the exact schematic is.

If you are, as I assume, looking to wring more volume out of the chip I would suggest bridging. Invert phase however you like and drive each side of the speaker with a separate chip. It can be as simple as using the inverting on one and the non on the other; or you could use the (assuming there is one) FET buffer to do so by connecting equal value resistors to source and drain and taking the ouput from there. You also get the benefit of being able to leave the output caps out in this case, as both ends of the speaker will be at the same potential. Just make sure that the output is left floating because referencing it to ground will surely blow something up.

If you're looking for headroom, well this can help too. You can attenuate the input by a decent amount whithout losing much -if any- volume.

[mistahead]

Thanks, bridged 386-4s was the plan, pretty much exactly as described from start to end 

Will play around with your suggestions and see what I can get going, making an SS practice amp to push my little ten inch.

Was buzzing out oddly but I was playing around with a beer can speaker.

Ta

[Gurner]

If bridging is the plan...I'd just source a bridged IC & be done with it....TDA7052.

[mistahead]

I may even have one of those lying around...

I have a pile of 386's see...