[Elecraft] RE: [OT] Burglar alarm/latching relays

[DAVE HEALY]

Thom wrote:

"Anyone have an old alarm system they want to sell....or some quick and
dirty circuit that I can use to have normally closed switches cause a
contact closure on a siren when the door/window is kicked in?"

Thom, we don't have too many human break-ins here in S. Oregon, but plenty of animal assaults.

They assault my Koi ponds (The Raccoons).

I've found that a simple IR motion detector hooked to a home-brew 400-watt ultrasonic amp with Motorola transducers sweeping from 4K-26K really does the trick on those bandits. I haven't figured out how to stop the deaf ones, however.

IMHO, the IR motion detector (some are about US$12) with one outlet hooked to a siren would cover much of the flat for the least amount of $.

Much easier and cheaper than wiring all the windows and doors or installing a breaking-glass pickup and then they breach the door and it doesn't fire.

Good luck, my friend.

73,

-dave- N7DKK Medford, Oregon