Re: Power Supply Rectification and Smoothing

On Tue, 16 Oct 2007 12:35:36 +0100, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:



spamfree@xxxxxxxxxxx wrote:

Eeyore wrote:

Such transients won't
appreciably affect the voltage on the reservoir caps, there isn't enough energy in
them to do so.

Surely that depends on how much energy is in the mains transients.
With a rated surge tolerance of less than twice the nominal working
voltage.... Careful Laddie, ye'll get a bullet! :)

I suggest you take a look at the voltage on some reservoir caps with a scope and look
for these alleged transients that over-volt them. You'll be looking a long time.

OK, I will one day. But can you see my dilemma? I see you use
intemperate language and assert errors, so how can I take notice of
what you say here? YOU may know what you know, and what the status is
of what you say, but I'm afraid that I can't tell. jack

ps My problem with your advice is that it seems so black-and-white
and adamant. From my reading of the EvoxRifa article, it seems that
capacitor life is the key factor. The electrolytics in some of my
catalogues are rated at ~2000 hours. Evox Rifa seem to be saying that
spikes and transients (yes, from the mains) can shorten cap life. If
you are saying that this is not significant in the case I'm citing
here, then that's fine, but to scream that anyone who states the
principle, or who disagrees with your proclamations is a grade one
IDIOT, or should be SHOT shows your advice is flaky at best.
.

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