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Old 17th August 2001, 04:01 AM   #1
Chad is offline Chad  United States
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I'm new at this stuff, how do I change nfarads and pfarads to ufarads? Thankyou for any help you can give me.

Thanks, Chad
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Old 17th August 2001, 04:08 AM   #2
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Chad,
The basic unit of capacitance is the Farad, named after Michael Faraday. To get microfarads (mF, mFd, or uF), multiply by 10**-6. To get nanofarads (nF), multiply by 10**-9. For picofarads (pF), multiply by 10**-12.
Microfarads and picofarads are the most common designators, with nanofarads coming in third. To get a whole Farad in one place (at least at anything over 12V) takes a fair hunk of change, so you won't be seeing a lot of schematics specifying capacitance in Farads.

Grey
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Old 17th August 2001, 04:21 AM   #3
Chad is offline Chad  United States
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Thanks Grey,
If I figured it right a capacitor with a 470pf value would equal .0047uf and a 470nf would equal .47uf. Is this correct or is my math bad as usual?

Thanks, Chad
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Old 17th August 2001, 06:10 PM   #4
haldor is offline haldor  United States
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Hi Chad,

Something to watch out for is some schematics will use mF as millifarad (1 millifarad = 1000 uF).

This is usually a holdover from older designs (references to cycles per second instead of Hz is a dead giveaway), but not always. So be cautious, if the power supply filter caps on a power amp are 15 mF, you can bet they really mean 15,000 uF not 15 uF.

Phil
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Old 18th August 2001, 12:41 PM   #5
djk is offline djk
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"a 470pf value would equal .0047uf " No, .000470f = 470pF
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