|Build this battery / mains powered DIY alarm using cheap off-the-shelf components. It's suitable for all types of premises - including caravans and mobile homes. |
This is a photograph of the enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds - and I've added a timed Siren cut-off and automatic Reset. I've also replaced the LED with an entry Buzzer. These enhancements mean that the new version will have a much wider application.
Although it can be mains powered - the extremely small standby current makes it ideal for battery-powered operation. I've used a 9-volt supply in the Schematic Diagram - but the circuit will work at anything from 5 to 15-volts. Just choose a Relay, Buzzer and Siren suitable for the voltage you want to use.
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