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Laser burglar alarm 1973 howto build plans
Laser Burglar Alarm 1973 HowTo Build PLANS
Plans to build a Laser Burglar Alarm. This laser perimeter system throws a nearly invisible cordon of light around the house which when broken causes an alarm circut to set off a warning signal (such as a bell, siren or horn).
* These plans are from 1973 so you should be prepared to substitute, or search for needed componets.
This is an original 5+ page magazine article from 1973.
* Schematic Drawings and Photos
