Build this single zone DIY burglar alarm using cheap off-the-shelf components. It's suitable for all types of premises - including caravans, campers and mobile homes.
This is a photograph of the single-zone Transistor Based 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-open and normally-closed input devices such as - pressure mats - magnetic reed contacts - micro switches - foil tape - and PIRs.
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