In Reply to: Need Help Making a 3 pole active Low-Pass Filter posted by Hjourzt on September 29, 2012 at 18:53:16:
I am curious - having done my fair share of ENG work, I have never encountered the problem you describe. How do you arrive at the 25K figure?
Is this a statement from the manufacturer of said motion detectors?
In any case you should look into other causes for these phenomena, I remain skeptical that the detectors are the culprit. I fail to see how the gear you describe - and which I also have extensively used - manages to somehow convert these frequencies into audible range at playback.
Try out the www.gearslutz.com forum - these folks will point you in the right direction for your filter.
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Follow Ups
- RE: Need Help Making a 3 pole active Low-Pass Filter - Palmer 11:31:33 10/03/12 (0)