When I worked at DAK they bought the brand of a very high end amplifier company, A common theme in all the amps was that all the ground traces went to a common point/solder point that was tied to the chassis. Prevents ground loops, and in a high gain chip power amp ground loops spell disaster. Who can hear the 1mz oscillation of a poorly designed board? That is until the magic smoke appears. This is the only circuit I found with the recommended 10ohm with a few turns of wire to prevent oscillation.
Another theme was torrid transformers - much better regulation of the voltage out, and quieter too. However i fear i will have to forgo this as a luxury. I am on a strict budget. I have some 25v ct transformers in the junque box, and the lower voltage means less power, and a smaller output heat sink - the chip is capable of ~68w - I am only looking for 10w or so. Even at that level the wife will probably yell - even if i could hear her :-)
Speaking of cheap I went yard saleing and found for $.50/ea a pair of 6" car speakers. I thought that they would do quite the job for this amp. They looked like they can handle the power, and with the full range - the acoustic guitar I am planning to hook up to this mini beast will probably sound more like and acoustic and not a buzz saw electric.
... off to google a pre-amp/tone controls for the project....
..... Googleing, Googleing .......
Found it - http://www.generalguitargadgets.com/richardo/practiceamp/practicemaneq.gif - a banaxle opp amp based design. Kewl...
