Dave Plowman wrote:
In article ,
G&M wrote:
Most of the IC suppliers have demo boards using their amplifier chips -
perhaps you could tie one of these to a big wallwart.

You'd be talking about a very weedy amp if a wall wart would power it.

You can get surprisingly powerfull SMPS wall-warts.
The biggest I remember off-hand is around 30W.

The key is to run the transformer at a really high frequency, so you can
fit more power through.

Easily enough to power a gigawatt of speakers (Peak Invented Music Power).