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Old 4th June 2008, 03:15 AM   #1
rman is offline rman  Canada
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Default L as last filter element?

Hi all.

I was reading about someones preamp project where they
are using a large value plate load choke because they belive
it can deliver current for transients better than a power supply's
last capacitor. This got me to thinking, why can't the last element
in a psu filter be a choke? I have never seen a diagram for such,
it is always a capacitor. I can't imagine that no one has thought
of this before, so maybe there is some reason it is not a good
idea?

Just wondering.
Rolf
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Old 4th June 2008, 03:19 AM   #2
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The power supply output impedance should be small. The capacitor helps achieve this at higher frequencies. The impedance of an inductor goes up with frequency, so this is not a good idea.
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Old 4th June 2008, 03:31 AM   #3
rman is offline rman  Canada
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Thank's, that makes sense.
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