Today's Message Index:
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1. 02:06 AM - Re: Cheap-n-Dirty In-Line ATC (Bob Verwey)
2. 12:46 PM - Re: do I need to change my capacitor (jrevens)
3. 03:58 PM - Re: Re: do I need to change my capacitor (Charlie England)
4. 04:04 PM - Re: Re: do I need to change my capacitor (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Cheap-n-Dirty In-Line ATC |
That is a really frugal solution, fraught with simplicity and lightness!
On 7 July 2016 at 20:09, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> Needed to add a fuse to a device with limited
> space and very low current requirements. Wound
> up adding this ATC3 fuse to the gizmo using fast-ons
> and heat shrink. While not as robust as a legacy
> fuse-holder, the manner in which terminals are
> retained in the ATC fuse doesn't raise much concern
> for over stressing them with direct support
> of 22AWG wire.
>
>
> [image: Emacs!]
>
> Bob . . .
>
--
Best...
Bob Verwey
Message 2
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Subject: | Re: do I need to change my capacitor |
On another internet forum the question was posed - "Why do you need a capacitor
on the Rotax charging system?" A reply was posted by another member:
"In our charging systems, the stator produces AC output which goes to the regulator/rectifier.
The ouput of that is DC plus an AC voltage on top of it. A capacitor
is often used to filter out higher frequency AC ripple on the rectified
DC supply. It helps keep the electronics happy and audio quiet."
I'm curious if this is an accurate statement, or not.
--------
John Evens
Thorp T-18 N71JE (built & flying)
Kitfox SS7 N27JE (building)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457943#457943
Message 3
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Subject: | Re: do I need to change my capacitor |
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Message 4
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Subject: | Re: do I need to change my capacitor |
At 02:44 PM 7/8/2016, you wrote:
>
>On another internet forum the question was posed - "Why do you need
>a capacitor on the Rotax charging system?" A reply was posted by
>another member:
>
>"In our charging systems, the stator produces AC output which goes
>to the regulator/rectifier. The ouput of that is DC plus an AC
>voltage on top of it. A capacitor is often used to filter out higher
>frequency AC ripple on the rectified DC supply. It helps keep the
>electronics happy and audio quiet."
>
>I'm curious if this is an accurate statement, or not.
This statement and similar ones have been
around for a long time. They have a 'ring
of truth' about them. Everybody knows that
capacitors are a hedge against noise. It's
also common knowledge that the higher the
noise frequency, the 'better' a capacitor
works.
This is a simplistic statement that is un-
quantified (how high is high?) and just
how does ripple on the bus figure into
'quiet audio systems'. I did some simple
demonstrations with an SD-8 on B&C's bench
about 20 years ago wherein I MEASURED the
effects upon ripple voltage for both the
battery and the legacy recommendation for
a 'filter' capacitor.
I was unable to support the notion that
the capacitor was a useful addition to the
system. It doesn't hurt anything but I'm
unable to demonstrated that it helps anything
either.
The test-bench under construction will explore
next generation options for PM dynamo rectifier/
regulators. It will also be instrumented adequately
to explore answers to the capacitor question in
more detail with a test report with measured
data.
But based on what I observed 20 years ago and
since, I'm not a big proponent of adding
fat caps to the bus. I may be wrong. If so,
the REAL answer will be in somebody else's
test report wherein it is demonstrated that
some problem was mitigated by addition of
a capacitor. But for now, my inclination is
to suggest that the capacitor is equally
effective in warding off meteor strikes.
To the question in your subject line, what
makes you think the capacitor is bad? Without
evaluation on appropriate instruments, it's
a rather enigmatic device. Of course, if it's
all puffed up, leaking gooey stuff or smelling
bad . . . well . . . yeah. The puppy has gone
TU.
Bob . . .
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