I'm trying to build a 2-10w amp that will run off of batteries that will power a pair of 6" car speakers that I pulled out of my car. I've already built a lm386 and ba546 amp but they just aren't powerful enough.
Very sorry. I had seen it in an issue of Everyday Practical Electronics at the British Library here. Unfortunately, I misplaced the copies. I will be happy to intimate you when I find it.
Meanwhile you could try other TDA (2020, 2030 etc) circuits available on the net.
This amp on a chip can be used in both inverting and normal fashion. There is an entire board on www.ezboard.com devoted to single chip amps and the LM3875 seems to be the favorite. The only difficulty with the LM1875/3875 is that leads should be short. I think that it's a great little chip.
Linn uses a single chip amp (it's a TDA) in their Majik.