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Author Topic: Fuse question  (Read 2233 times)

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ChadTower

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Fuse question
« on: October 15, 2005, 07:51:43 pm »

I'm working on a Laser Cue pin (in projects section)...

The HV fuse on the power board lists in the schematic as .25a SB, but the one on the board is .5a.

Is that an acceptable substitute?  Instinct is no, since that is a full 100% increase, but it is still only a quarter of an amp too.
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SirPeale

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Re: Fuse question
« Reply #1 on: October 15, 2005, 09:21:42 pm »
You're correct.  See my answer in the project announcements thead.
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Karetaker

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Re: Fuse question
« Reply #2 on: October 26, 2005, 11:46:47 am »
I find that ALL the time with home calls. People just aren't very good at troubleshooting. My favorite is walking in and finding tin foil wrapped around a fuse. Sometimes it looks like a little homemade aluminum foil fuse bomb with burnt foil scattered about...hehehe. Some people view the fuse values like the speed limit..... they think it's just a guideline.
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ChadTower

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Re: Fuse question
« Reply #3 on: October 26, 2005, 12:04:21 pm »

Wrapping in foil would just bypass the fuse, yes?

Well, until the foil caught fire.
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Karetaker

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Re: Fuse question
« Reply #4 on: October 27, 2005, 04:57:57 pm »
Yes, foil bypasses the fuse.... I'm not sure what the amp rating is on foil, but I'm sure it's pretty high. I guess people think because the fuse is blowing, that it is the fuse itself that's the problem. It's not until smoke is rolling out of the machine that they realize that the fuse may not be the culprit after all.
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Havok

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Re: Fuse question
« Reply #5 on: October 27, 2005, 05:58:20 pm »
Fuses are symptoms, not the cause. I have seen the same thing. And then the person is like, what? I did something wrong? It kept blowing fuses!

I will always have a job...
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Karetaker

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Re: Fuse question
« Reply #6 on: October 28, 2005, 11:24:38 am »
Quote from: Havok on October 27, 2005, 05:58:20 pm
Fuses are symptoms, not the cause. I have seen the same thing. And then the person is like, what? I did something wrong? It kept blowing fuses!

I will always have a job...


Hehehehe!!! You and me both.
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jopenner

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Re: Fuse question
« Reply #7 on: November 11, 2005, 01:20:13 pm »
I have just tapped into my motherboards power supply cable and have run a 12 volt (yellow & black) and a 5 volt (red & black) line back to my CP.  Should I place an inline fuse on these lines and if so, what fuse rating should I use?
I use the 12 volt for my illuminated trackball and paln to use the 5 volt for LED later on.

John
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Ed_McCarron

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Re: Fuse question
« Reply #8 on: November 11, 2005, 01:33:16 pm »
Quote
Should I place an inline fuse on these lines

Can't hurt.

Quote
what fuse rating should I use

Decide how much current your bulb will draw at 12v, and size the fuse > than that, but < the power supply's rating.

I.E., the bulb draws 250ma.  Go with a 1A slowblow fuse.  Gives you 750ma worth of headroom, and the slowblow prevents the fuse from blowing from the bulbs cold filament inrush.  It's kinda a ballpark thing.

Ditto on the 5v line.

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