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Suppress transients on old burglar alarm

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Phil Hobbs
Guest

Tue Jun 19, 2018 10:45 pm   



On 06/19/2018 02:24 AM, Terry Pinnell wrote:
Quote:
Terry Pinnell <me_at_somewhere.invalid> wrote:

Before trying your filter I re-assembled in the slight hope that my
removal/replacement (and touching up a couple of joint that looked
mildly suspicious) might have fixed the spurious triggering. I tried a
few dozen times, switching the cupboard lamp on/off as described
earlier, and so far so good!

Left the temporary sounder in place to try over a few successive nights
and will report back on final outcome.


Thanks for your patient help, which is much appreciated.


***** That last status report was prematurely optimistic. Turned out to
be two faulty microswitches, both intermittent. One was a rusted (and
greatly weakened) magnet, the other a sticking shed window. And both at
the far end of the loop, so many hours before I found them.

Terry, East Grinstead, UK

It's always something. Wink


Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

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