Path: utzoo!mnetor!uunet!husc6!think!ames!pasteur!ucbvax!decwrl!hplabs!hpda!hp-sde!hpfcdc!hpficad!stu
From: stu@hpficad.HP.COM (Stu Bell)
Newsgroups: sci.electronics
Subject: Class D Power Amplifiers?
Message-ID: <4110001@hpficad.HP.COM>
Date: 5 May 88 20:40:38 GMT
Organization: Hewlett Packard CICD
Lines: 16

Okay  audiophiles,  I've been out of touch with hi-tech audio trends since I
left college (and my audio fanatic roomie) 9 years ago.

Whatever  happened to Class D (digital)  power  amplifiers?  I remember that
Infinity (or was it Phase  Linear?)  came out with one in 1978, but I assume
it failed  miserably  since it (or a reasonable  facsimile) is no longer for
sale.

What's wrong with pulse modulation  (essentially  the digital  approach) for
power  amplifiers?  Do the high frequency  harmonics of the square waves fry
speakers?

Stu Bell
HP Colorado IC Division

"No Clever Quotes, Just Honest Curiosity"