Re: Power for Audio

On 31 Jan 2006 11:16:08 -0500, kludge@xxxxxxxxx (Scott Dorsey) wrote:

>Don Pearce <donald@xxxxxxxxxxxxx> wrote:
>>
>>Have you *really* had power line harmonics find their way through to
>>your audio lines? I'm frankly stunned. It takes only the most barely
>>competent power supply design to effectively kill that stuff ( and
>>remember, the higher the harmonic, the better the capacitors kill it).
>
>Sure, all the time. Not that it leaks through the transformer so much
>as that it leaks into the grounding system by capacitive coupling. Also
>leaks into anything nearby.
>
>In a lot of cases the harmonics are so bad that they radiate as RF.
>
Ah - that is a different matter, but again a matter of competent
design to prevent it. Any equipment that will keep out a local medium
wave radio station should keep out a little radiated mains.

>>Add to that the fact that the most barely competent amplifier will
>>have sufficient common mode rejection to deal with whatever remains.
>>
>>I can only think that you've encountered some of the worst audio gear
>>ever made (I won't say designed, because that wouldn't be fair).
>
>No, I have encountered some of the worst lighting gear ever made.
>--scott

Now you're talking. It just takes one triac spreading crap.

d

Pearce Consulting
http://www.pearce.uk.com
.

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