[sdiy] battery powered resonant filter?

[denshi]

hello all!

ive been perusing the internet for filter designs, but
havent found what im looking for and was wondering if
someone could help.
id like to "graft" a simple resonant filter onto some
of my older (read: knobless) keyboards but im not
really comfortable messing with their power supplies
to leach power for the filter.
i guess im looking for a nice little filter
(preferably korg style) that can be battery powered or
power with a wall wart without too much hassle.  im
still a novice at construction.
thanks all!

seth

__________________________________________________
Do You Yahoo!?
Sign up for SBC Yahoo! Dial - First Month Free
http://sbc.yahoo.com