tyler_durden;172678 Wrote:
> If you are looking for a minimal power drain amplifier, get a "Class-D"
> amplifier. They are essentially switch-mode power supplies with the
> input signal as a reference and the output connected to a speaker.
> Efficiencies run as high as 90%. These are relatively new and not many
> are available
I don't know if they are many available or not for general home use,
but they are often used in high power car systems, and the fist
comercially available one I saw actually being used was back in 1980
(27 years ago), so they are not all that new. But yes, they are
extremely efficient. I always wanted to make one with a digital input
directly controlling the PWM, thus elimination the need for a
conventional D/A converter, but so far have been too lazy to do so.
Tom
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st2lemans
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