Re: Groundplane in poweramplifier PCB design

In article <e25p79$10l$1@xxxxxxxxxxxxxxxxxxxxxxx>,
Wiebe Cazemier <halfgaar@xxxxxxx> wrote:
On Wednesday 19 April 2006 05:00, Ken Smith wrote:
I'd worry a lot more about a reactive load.

What about a reactive load? Isn't any speaker a reactive load?

A speaker has a significant fraction of its impedance as resistive, within
the audio band. If you hook a large valued good capacitor across the
output of the amplifier, you can cause a large AC current to flow. The
capacitor, being a good one, doesn't burn up any power, so obviously, all
the power has to go up in heat in the output stage of the amplifier.

Many an amplifier has been smoked this way.

[...]
As you can read in my reply to Ban's message, the absence of a current limiter
is intentional. I also don't plan to include one. In all the time I have used
the amp, and all the others that where built, it has not been necessary.

I've never needed my seat belts but I still wear them.



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