🚀 go-pugleaf

In article <1d5lraINNp3f@moe.ksu.ksu.edu> hampster@phys.ksu.edu (Kip J. Mussatt) writes:
>In <1d3p0oINNlu3@moe.ksu.ksu.edu> hampster@phys.ksu.edu (Kip J. Mussatt) writes:
>
>>I am looking to make a high Q, low bandwidth filter, bw = Hz with 
>>a center frequency of 25 Hz.  Burr-Brown makes some active filter
>>chips, but they don't look too impressive, they are 16 pin and still
>>require 4 external resistors.  Each chip only produce a two-pole filter
>>effect.  I need to pass the 25+/-10 Hz signals and NOT pass at all
>>any surrounding 10Hz or 60 Hz signals that are present in the line,
>>if this helps.   Does anyone know of any place /source of such a 
>>possible filter?  
>Just so this is clear, I don't want to process the signals via a uProc.
>I'm looking for something that is very real time, since Im only looking
>for the signals within a certain band, I don't really want to do spectral
>analysis. 
>>-Kip J. Mussatt

Kip:
Check out TTE's active 3 pole Butterworth active filters. They seem 
that they might be just what you're looking for. Contact them at
(213) 478-8224, Los Angeles. In their catalog vol. 34, check out page
5-5.

Regards, Doug

-- 
+-----------+---------------------------------+--------------------------+
| Doug Reed | HP3065AT Board Test Engineering | Kennedy Space Center, FL |
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| Ham Call N4QVY | #include <std_disclaimer> | Lockheed Space Operations |