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 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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Simple Door Alarm - Photograph

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This is a photograph of the Cmos 4001 based Door Alarm . Fit it to a door, window, shed, garage, cupboard etc. It'll alert you to intruders. Add a siren - and it becomes a simple burglar alarm. It has an extremely low standby current - and it's ideal for battery operation.
A Photograph Of Ron J's Cmos 4001 
Based Door Alarm - Circuit Board


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