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Author Topic: How does one calculate what type of capacitor to use?  (Read 2746 times)

monkey_sass

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How does one calculate what type of capacitor to use?
« on: October 10, 2003, 09:23:11 PM »

I am wondering if anyone knows a good site/guide wherein I could find an explanation of how to decide what type/size of capacitor I should use for a specific application.

My application is this:

Nearly every time I hit the brakes in my car (91 Subaru Legacy with some weird electrical problem :wtf: ), the radio dies for about a second.  I don't want this, so I was thinking of placing a capacitor in the power line to sort of smooth things out.  I'm using just a standard AIWA CD player, no amplifier, no major googaws attached to drain massive power--I just want to hear NPR on my way home without interruptions every time I brake.

Any help would be appreciated.
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Skylined

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How does one calculate what type of capacitor to use?
« Reply #1 on: October 10, 2003, 09:55:40 PM »

No need for a capacitor, what you have to do is what's wrong with the brake.
Try to see if you have a short or something like that.
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monkey_sass

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How does one calculate what type of capacitor to use?
« Reply #2 on: October 10, 2003, 10:11:49 PM »

The car has a number of electrical problems that no one can seem to fix--neither myself or 3 separate mechanics.  I'm sure there's a short somewhere, but I'd rather just avoid the problem with a capacitor, if that's possible.

Unless, of course, you'd like to come over and fix my car!?
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Skylined

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How does one calculate what type of capacitor to use?
« Reply #3 on: October 10, 2003, 10:18:10 PM »

If you pay me the plane ticket + hotel + food + 50$ I'll try to see what it has... and for 200$ if I can I'll fix it.
This would be more or less 1500$ - 2000$

You cannot avoid the problem, fix that problem and that's all.
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monkey_sass

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How does one calculate what type of capacitor to use?
« Reply #4 on: October 11, 2003, 08:44:04 AM »

hmmm--I guess its back to the grindstone iwth the multimeter for me, then.
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viridius

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How does one calculate what type of capacitor to use?
« Reply #5 on: October 11, 2003, 06:22:59 PM »

You could try plugging in a 1000uF or so capacitor (rated to 50 volts) into you cigarette ligher socket or directly across the power leads of the stereo.  I can't guarantee anything though.
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monkey_sass

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How does one calculate what type of capacitor to use?
« Reply #6 on: October 11, 2003, 07:43:47 PM »

So, is there a site I can go to to learn a little more about capacitors (like wtf uF stands for, and why 50 volts instead of 16, or 12, etc)?
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Skylined

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How does one calculate what type of capacitor to use?
« Reply #7 on: October 11, 2003, 09:30:21 PM »

The voltage depends on the supplied voltage, get a capacitor with a higher voltage than the one you're gonna work, so you're safe, and in general they aren't more expensive, maybe a lil bit..
Cars have a voltage around 13V - 14V.
And uF means micro Farads, that's 0.000001 Farad.
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monkey_sass

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How does one calculate what type of capacitor to use?
« Reply #8 on: October 11, 2003, 10:24:43 PM »

Cool, Thanks.   I'm assuming that a Farad is a unit of stored power?
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i7dude

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How does one calculate what type of capacitor to use?
« Reply #9 on: October 12, 2003, 12:20:39 AM »

not stored power ... stored charge

power is measured in watts

dude.
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