Build this single zone DIY burglar alarm using cheap off-the-shelf components. It's suitable for all types of premises - including caravans and mobile homes.
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Automatic Intruder Alarm - Photograph

MORE ALARM CIRCUITS


Automatic Intruder
Alarm - Schematic
The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International

Circuit Board

This is a photograph of the simple single-zone Automatic Intruder Alarm circuit board. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. It's designed to be used with the usual types of normally-closed input devices such as - magnetic reed contacts - micro switches - foil tape - and PIRs. But it can be Easily Modified to accept normally-open triggering devices - such as pressure mats.

A Photograph Of Ron J's 
Automatic Intruder 
Alarm - Circuit Board


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Automatic Intruder
Alarm - Schematic
The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International