Jim Lesurf wrote:

Personally, for active filtering, I'd tend to prefer using a LPF, then
creating a HPF output by subtracting the LPF output from the input.
The result if you keep the levels matched is a LP and HP pair of
signals whose vector sum always equals the input. Thus the combined
result shows no phase errors due to the filtering.

That's a neat trick. (Maybe tri-amping isn't such a bad idea...)


For the actual filters I tend to lift the basic designs from the
Active Filter Cookbook by Don Lancaster.

taking notes


--
Wally
www.artbywally.com
www.wally.myby.co.uk/music