🚀 go-pugleaf

I've recently been following a tread on rec.audio about class D audio amps.
As I understand it, in a class D amp, the audio signal is converted into
a pulse width modulated clock signal of around 100 kHz.
This is then fed into the loudspeakers which by their nature convert
the pulses back into audio.

That's about the sum total of my knowledge.
Would anyone like to post or send me a more explicit description of
how one of these amps works.
I'd like to know:

1) exactly how the thing amplifies the signal;
2) whether one needs special speakers or speaker parameters for this system;
3) how to build a simple low power example of such an amplifier for my
   own amusement to prove the priciple to myself.

Following on from this, I had the idea that an integrated digital CD
stage class D amp could be constructed where no analgue stage would be
needed. The circuitry would convert from the PCM data from the disk
to PWM signals for the loudspeakers.

Is anything like this remotely possible 
or am I BSing with the best of them?

-- 
Rob Scott
Department of AI                Tel: 031-650-2713
University of Edinburgh         FAX: 031-226-2730
80 South Bridge               email: rbs@aisb.ed.ac.uk
EDINBURGH
EH1 1HN