1 farad power cap

odysseybmx414 · 25th March 2005, 07:33 PM

just a random question. would a 1 farad power capacitor (this thing is huge) have any value for use in home audio amp apps? i dont want to try it without a couple opinions. i was thinking in the lines of the power supply

Bill Fitzpatrick · 25th March 2005, 07:43 PM

You'ld have to use an inrush current limiter and wait quite a while for it to fully charge before shorting out the limiter. Of course you can't exceed the voltage rating of the cap. Try it and keep us informed.

LineSource · 25th March 2005, 07:56 PM

Most power supply designers also look at the AC resistance or ESR at 120Hz and 20Khz, and the lifetime at say 85C or 105C.

The lowest ESR often comes from putting a few large, but not huge, caps in parallel. Doubling the Farads often just reduces the ESR by 20%. Low ESR allows large transisents with little voltage droop.

You should also consider the Lifetime. The computer grade capacitors can have 5,000 - 10,000 hours at 85C. The 1 Farad auto capacitors may not be as robust or be able to remove internal heat as easily as a lower storage density computer grade design.

Stocker · 25th March 2005, 08:09 PM

The average home theater amplifier is extremely unlikely to put so much stress on the power supply as to tax a 1F capacitor.

Lsharptec1 · 25th March 2005, 08:47 PM

One thing that must be kept in mind is that 1.0 Farad capacitors have a maximum voltage rating of 16 - 22 VDC.

Most home audio equipment uses +/- rails well above 22 VDC.

zek · 25th March 2005, 09:23 PM

This big caps can be used for Hiraga Monster PSU (+/- 12V)

moving_electron · 25th March 2005, 10:01 PM

I would imagine a 1F capacitor would be extremely dangerous when not fully discharged. I image it can discharge extremely large currents is accidentally touched.

Course that is not to say a 10,000uF cap cannot kill you.

carlosfm · 25th March 2005, 10:06 PM

Quote:

Originally posted by moving_electron
I would imagine a 1F capacitor would be extremely dangerous when not fully discharged. I image it can discharge extremely large currents is accidentally touched.

Course that is not to say a 10,000uF cap cannot kill you.

Depends on the operating voltage.
You can touch with your hands on the terminals of an 100A 12V car battery and nothing happens.
We humans only get an electrical shock at around 60~70 volts and up.

Tweeker · 25th March 2005, 10:17 PM

Unless your wet of course. Try licking a nine volt battery, its interesting.

pinkmouse · 25th March 2005, 10:24 PM

If your skin is broken, 24V can kill.

25th March 2005, 07:33 PM	#1
odysseybmx414 diyAudio Member Join Date: Feb 2005 Location: Watertown, NY	1 farad power cap just a random question. would a 1 farad power capacitor (this thing is huge) have any value for use in home audio amp apps? i dont want to try it without a couple opinions. i was thinking in the lines of the power supply

25th March 2005, 08:09 PM	#4
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	The average home theater amplifier is extremely unlikely to put so much stress on the power supply as to tax a 1F capacitor. __________________ Jesus loves you.

25th March 2005, 10:24 PM	#10
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	If your skin is broken, 24V can kill. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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25th March 2005, 07:43 PM	#2
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	You'ld have to use an inrush current limiter and wait quite a while for it to fully charge before shorting out the limiter. Of course you can't exceed the voltage rating of the cap. Try it and keep us informed.

25th March 2005, 07:56 PM	#3
LineSource diyAudio Member Join Date: Sep 2003 Location: SiliconValley	Most power supply designers also look at the AC resistance or ESR at 120Hz and 20Khz, and the lifetime at say 85C or 105C. The lowest ESR often comes from putting a few large, but not huge, caps in parallel. Doubling the Farads often just reduces the ESR by 20%. Low ESR allows large transisents with little voltage droop. You should also consider the Lifetime. The computer grade capacitors can have 5,000 - 10,000 hours at 85C. The 1 Farad auto capacitors may not be as robust or be able to remove internal heat as easily as a lower storage density computer grade design.

25th March 2005, 08:47 PM	#5
Lsharptec1 diyAudio Member Join Date: Oct 2004	One thing that must be kept in mind is that 1.0 Farad capacitors have a maximum voltage rating of 16 - 22 VDC. Most home audio equipment uses +/- rails well above 22 VDC.

25th March 2005, 09:23 PM	#6
zek diyAudio Member Join Date: Aug 2003 Location: Belgrade, Serbia	This big caps can be used for Hiraga Monster PSU (+/- 12V)

25th March 2005, 10:01 PM	#7
moving_electron diyAudio Member Join Date: Jan 2004 Location: Where the rain does fall but the trees grow tall	I would imagine a 1F capacitor would be extremely dangerous when not fully discharged. I image it can discharge extremely large currents is accidentally touched. Course that is not to say a 10,000uF cap cannot kill you.

25th March 2005, 10:17 PM	#9
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Unless your wet of course. Try licking a nine volt battery, its interesting.

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