GeoB
Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA
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 Posted: Thu Aug 21, 2014 12:43 am Post subject: capacitor |
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| Quote: | Its the large one, 20-25000
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I asked out of curiosity, but I know this value is not a critical thing.
Greater or lesser will probably work the same except in extreme cases. This
depends on the current you are pulling and the nature of transient spikes
(hash, static) you have in your power.
Those tiny lil pale orange ceramic disks found on computer equipment do the
same thing. They can be tiny because the current is tiny and the supplied
power is generally very good. They do have to suppress the tiny spikes
generated by the opening and closing (cycling) of the electronic gates
inside the chip.
The voltage spec is more important. With very dirty power and pulling a lot
of current you will need a higher voltage. When a spike hits the cap it can
puncture the insulation and element inside (foil generally) and short it
out, if it is high enough voltage. You can test for this by the way a cap
holds voltage in it. It should be able to hold a given voltage overnight.
Its hard to measure though! But in the morning if it bumps your meter needle
then it is probably good. A bad cap potentially could drain a small battery.
Not something you are likely to see every day.
| Quote: | some one furnished earlier says the ground should go straight to the
battery
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It is very important to have an excellent ground on everything electrical on
the plane. You can hook the cap to any ground and it will work but for extra
insurance going to the battery is better. Sometimes extra engine grounding
pays dividends in a variety of ways too.
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_________________
GeoB
"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors" |
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