Does anyone know a modern active filter like n8 that
one can use at like 3 or 4 hz rolloff ??

I look at the manufacturers sites but like thay
are designed for the Khz ranges ?

it needs to rolloff butterworth to like -80Db
 or vin/10000

Im looking for something simpler that a two stage
MFB active opamp type to breadboard.
they are easy to design but not easy to get matched parts for.

thanx
geoff







Does anyone know a =
modern active=20
filter like n8 that
one can use at like 3 =
or 4 hz=20
rolloff ??
 
I look at the =
manufacturers sites=20
but like thay
are designed for the =
Khz ranges=20
?
 
it needs to rolloff =
butterworth to=20
like -80Db
 or=20
vin/10000
 
Im looking for =
something simpler=20
that a two stage
MFB active opamp type =
to=20
breadboard.
they are easy to design =
but not=20
easy to get matched parts for.
 
thanx
geoff