EMRFD Message Archive 2740
Message Date From Subject 2740 2009-02-25 19:09:22 Sam Morgan NEScaf modification for notch filter Sorry if this is to off topic, but I don't seem to be able to get any helpful
input from other lists I ask on. Maybe there is a NEScaf list, but I haven't
I want to modify my (as of yet unbuilt) NEScaf filter
so it works as a notch filter, rather than as a bandpass filter.
Problem is I don't know how to do go about doing it.
Here is the original pdf for the bandpass model:
Here is the pdf for the LMF-100 chip:
there are some formulas in there that may be the key,
but they are over my abilities, at least if I want to
build this sometime this year.
TIA for any help
GB & 73
2742 2009-02-26 04:11:47 Paul VDP Re: NEScaf modification for notch filter Hello Sam,
Try next link for data on MF100. Has a lot of math but also links to datasheet and app.notes from former type MF10. (...MF100 is just next generation of MF10, otherwise essentially the same.. Seems that the MF10 produced a bit more hiss than the MF100...)
The website from VK5BR also has a design including a MF10 configured for t-notch...
In this link, the datasheet for LMF100 from National. Has circuit example for notch-configuration at page 25.
Hope all this helps.. maybe till somebody can provide a circuit-example that resembles the NEScaf-design well enough to be more clear/specific about the necessary modifications......
Rgds & 73
Paul - on4bxz