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Posted 1st July 2010 at 10:28 PM by DougL
Updated 14th September 2010 at 06:34 PM by DougL


Motorola used one on their first cell phone.

Chauser eleptical low pass with nulls at 4.5k and 9k iirc.

Now I am wondering if I could create a "passive line level" with this, avoiding inductors.

Here is a link to a design article:
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Total Comments 3


  1. Old Comment
    wintermute's Avatar
    Hi Doug, although I still haven't got around to building it, if you haven't already, have a look at my blog entry for my active crossover design. I'm using an FDNR in the lowpass and the idea was indeed to simulate a passive crossover network. http://www.diyaudio.com/forums/blogs...crossover.html

    The comments have a fully worked example of calculating the values for the FDNR, something that I found rather difficult to grasp, but got there in the end!

    I've read all the same stuff on the net regarding fdnr's and what is on my blog is what I came up with

    Posted 3rd July 2010 at 05:47 AM by wintermute wintermute is offline
  2. Old Comment
    Thanks Tony. Thats a great starting point for what I wanted to do.
    Posted 7th July 2010 at 04:33 AM by DougL DougL is offline
  3. Old Comment
    wintermute's Avatar
    glad it is of some help Keep us posted with how you go. I'm working on the powersupply layout at the moment so slowly getting there!

    Posted 7th July 2010 at 11:15 AM by wintermute wintermute is offline
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