On Jan 13, 17:03, ajp166 wrote:
> From: Pete Turnbull <pete_at_dunnington.u-net.com>
> >On Jan 12, 20:14, jpero_at_sympatico.ca wrote:
> >
> >> Sounds like PSU is reacting to overloading or medium shorts
> >> downstream of that PSU outputs. Also can happen with dried
> >> up capacitors (too high ESR).
> >
> >I don't think it's any of those. The regulators all make a similar
> noise
> >when I put them on a dummy load drawing 5A, on the bench. And I'm sure
> >it's not bad caps, as two of them are ones I repaired recently.
>
> This is normal for them as well as the older H780. They are very loud
> and the pitch varies with load as well. That is a side effect of older
> low voltage, low frequency switch mode PS designs of some 20+ years ago.
I suppose so, I just didn't think it ought to be so irritating!
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sun Jan 13 2002 - 21:09:20 GMT