[sdiy] Re:freq shift allp filter ?

[Fernando de Izuzquiza]

Thanks all for the help.
I will try to build JHs Dome filter. I hope I can manage calculations... BTW, anyone built it? At
least to have the values calculated correctly, I'm not a maths one...

The JHs implementation is amazing, by now I only plan to build the filter, not the rest of the
system, but it looks great.
Anyhow, it looks like not any quadrature oscillator will work well, but JHs looks too complicate for
me , since it needs input from the rest of the system modules...

I can not look at Electronotes, I do not own a copy, and I don't know if I would understand the
explanations... I'll look into EDN in order to try understanding this kind of filter...

Thanks again!
--
f
*

>http://www.oldcrows.net/~jhaible/tonline_stuff/hj_fs.html

>JH.


> Juergen Haible has a design on his site under the
> Frequency Shifter schematics...
>
> its also known as a 'dome filter'.
>
> There is more info in Electronotes (somewhere....)
>
> EDN or Electronic Design magazine had a(n) Design Idea or
> Ideas for Design on this subject as well.
>
> The phase difference is 90 degrees between the two filter
> sections... but might be many hundreds of degrees overall....
> (the absolute phase is NOT constant... only the difference)
>
> H^) harry