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ainut(at)knology.net
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 Posted: Wed Jun 22, 2011 2:59 pm Post subject: OT: will a cap help here, horn that uses lots of amps? |
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I bought an aftermarket horn for my wife's motorcycle that blows 10 amp
fuses when you use it. Can I put a capacitor in front of it to keep the
fuse from blowing? How do I calculate the size of cap to use?
Thanks,
David
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JLuckey(at)pacbell.net
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| Posted: Wed Jun 22, 2011 3:22 pm Post subject: OT: will a cap help here, horn that uses lots of amps? |
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Not sure what the cap will do for you, but I'm sure it won't help reduce
current in the circuit.
Are you thinking of a resistor? You could put a current-limiting resistor
in series with the horn, but then the horn might be a lot quieter. It would
require a little experimentation & knowing how many amps the horn draws.
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skywagon
Joined: 11 Feb 2006
Posts: 184
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| Posted: Wed Jun 22, 2011 4:06 pm Post subject: OT: will a cap help here, horn that uses lots of amps? |
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David,
I think that you meant what size "Resister" do I put in series with the horn
to reduce the current (amps).
It is probably going to be a low value 1 - 3 ohms and it will have to be
large in "watt" rating. 10 or more watts, depending on how long you beep
the horn.
Also, keep in mind that you are trying to make a tuned horn work on less
power, under 10 amps, than the current it was designed. So, by cutting back
the "power" to the horn, it will probably sound "weird"; maybe not even
presentable as a bike horn. Try it on the "bench" first before going to the
trouble of mounting it to the bike, etc. and discovering then, that it will
not do what you wanted it to do.
If you bike's wiring can handle say 20 amp loads with a short duty cycle, I
would upgrade the fuse to i.e. 20 amps and not modify the horn using a
resister. But, it is critical that you know that the factory wiring can
handle this level of current without frying.
Dave
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Wed Jun 22, 2011 6:50 pm Post subject: OT: will a cap help here, horn that uses lots of amps? |
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David a capacitor will filter DC current and pass AC current so it will not
work. What you want is probably a resistor which limits current flow. The
truth is that if the horn is blowing 10A fuses there is probably a short in
the coils of the horn. Bring it back and get another one.
Noel
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Noel Loveys
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Wed Jun 22, 2011 6:54 pm Post subject: OT: will a cap help here, horn that uses lots of amps? |
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Wattage can be calculated using the equation W=VI=I2R
Therefore if the horn is drawing ten amps(at)12V that is 120Watts DC That is
just too much current for the average bike horn.
Noel
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