Fdnr
https://www.diyaudio.com/forums/parts...-resistor.html
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:
https://electronicdesign.com/article/...sband6366.aspx
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:
https://electronicdesign.com/article/...sband6366.aspx
Total Comments 3
Comments
-
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. https://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
Tony.Posted 3rd July 2010 at 05:47 AM by wintermute -
Thanks Tony. Thats a great starting point for what I wanted to do.
Posted 7th July 2010 at 04:33 AM by DougL -
Posted 7th July 2010 at 11:15 AM by wintermute