Re: switchers and amps = bad?
From: Pooh Bear (rabbitsfriendsandrelations_at_hotmail.com)
Date: 01/30/05
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Date: Sun, 30 Jan 2005 00:13:40 +0000
"Michael (Micksa) Slade" wrote:
> While at the local parts shop doing my routine skulk around I asked about
> making an RIAA preamp and powering it with a switched (single-rail)
> supply, and one of the guys there went "nonono, bad idea, switchers are
> too noisy for audio applications".
>
> Is this true? I'm no veteran but as far as I know any supply noise should
> be able to be filtered out with sufficiently large/numerous capacitors,
> should it not?
Don't forget that switchers generate plenty of HF magnetic field too.
It concerns me more that in today's world you might be making an RIAA pre-amp
( any pre-amp in fact ) using a single supply rail.
The switcher I've just designed for a semi-pro audio mixer generates a mere
couple of hundred microvolts audio band noise on the supply rails btw.
Slightly quieter than the previous linear regulator based design but I did
apply extra filtering compared to a stock swicher. The magnetic field still
needs a small amount of taming - but you'd get even worse problems with a line
frequency transformer when the PSU is mere centrimetres from the pcb.
A line frequency supply is a lot easier to design though.
Graham
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