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Old 25th March 2005, 07:33 PM   #1
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Default 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
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Old 25th March 2005, 07:43 PM   #2
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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.
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Old 25th March 2005, 07:56 PM   #3
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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.
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Old 25th March 2005, 08:09 PM   #4
Stocker is offline Stocker  United States
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The average home theater amplifier is extremely unlikely to put so much stress on the power supply as to tax a 1F capacitor.
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Old 25th March 2005, 08:47 PM   #5
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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.
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Old 25th March 2005, 09:23 PM   #6
zek is offline zek  Serbia
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This big caps can be used for Hiraga Monster PSU (+/- 12V)
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Old 25th March 2005, 10:01 PM   #7
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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.
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Old 25th March 2005, 10:06 PM   #8
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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.
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Old 25th March 2005, 10:17 PM   #9
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Unless your wet of course. Try licking a nine volt battery, its interesting.
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Old 25th March 2005, 10:24 PM   #10
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