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LF: low pass filter for power use

from [Thomas Eckart] [Permanent Link][Original]
To: [email protected]
Subject: LF: low pass filter for power use
From: "Thomas Eckart" <[email protected]>
Date: Thu, 3 Nov 2005 17:21:52 +0100
Delivery-date: Thu, 03 Nov 2005 16:23:35 +0000
Envelope-to: [email protected]
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In-reply-to: <000901c5e005$e2d511c0$fe79a8c0@PCVONWALTER>
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Hi Lf's
in all circuit diagrams I find filters like 12nF---->54uH---->27nF----->54uH----->12nF
here is the 3db point at 250khz.
Has anyone test a filter in this configuration 47nF-----> 54uH----->82nF------54uH----->47nF
here is the 3db point at 147khz.
The 2. filter gives a better suppress of the harmonics!
Wat is the reason that all use the fist one?

best 73' Tom DL4EAU

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