Simple Door Alarm Circuit

This is a simple - easy to build - multi-purpose alarm. Build it yourself using stripboard or veroboard and a few cheap off-the-shelf components. Fit it to a door, window, shed, garage, cupboard etc. It`ll alert you to intruders. Fit it to a shop-door - and it`ll tell you when you have a customer. It has a very low stand-by current and is suitable

for battery operation.

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