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daojx
Joined: 20 Jul 2003
Posts: 36
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 21 Sep 2004 14:50 determine the power supply filter capacitor value |
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Suppose i want to filter out the power supply at 10Khz,
which capacitor should I choose:
1pF
1nF
1uF
1mF
1F
and why?
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jorgito
Joined: 26 Mar 2003
Posts: 159
Helped: 10
Location: Argentina
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| 21 Sep 2004 15:42 determine the power supply filter capacitor value |
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Hello daojx,
Assuming that there is an answer for such question, my best bet is to say that you have to select the capacitor that self-resonates at 10kHz.
Hope this helps
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 21 Sep 2004 16:26 Re: determine the power supply filter capacitor value |
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| There is an old trick where you use a series inductor in the filter and parallel resonate it at the frequency you want to notch out.
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khafaji
Joined: 28 Sep 2004
Posts: 19
Helped: 1
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| 08 Oct 2004 23:47 determine the power supply filter capacitor value |
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I think it is better that you use an inducer in range of milli or micro in parallel with two caps. one of them in range of micro and the other in range of nano.
this is to decrease the low and high frequency noises.
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