Peter, I think he was talking about an automotive system. Maybe you have
right but I don't saw yet a 500W quadro car power amplifier with PSU inside.
But you see, he need only a 50mA artificial earth which is really no
problem.

regards,
Vasile
http://www.geocities.com/vsurducan


On Tue, 4 Jun 2002, Peter L. Peres wrote:

> On Tue, 4 Jun 2002, Vasile Surducan wrote:
>
> >My friend,
> >I've just made a synchronisation between your last two mails and I have
> >a thought: never try to supply an analogic power amplifier from a
> >swithching power supply, you'll be very dissapointed...
>
> What about all those manufacturers who design and build home HiFi systems
> based on switching PSUs, that include phono amplifiers and microphone and
> tape amplifiers, along with AM radios and other delicate items. Not to
> mention VCRs (whose audio tape signal level is even lower than a phono
> amp's), and who haven't used iron transformers for the last ~12 years or
> so.
>
> Peter
>
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