It has an extremely small standby current � making it ideal for battery-powered operation. I�ve used a 9-volt battery in the diagram � but the circuit will work at anything from 5 to 15-volts. Just choose a relay and Siren suitable for the voltage you want to use.
It�s easy to use. To set the alarm move SW1 to the �set� position. You now have about 10 to 15 seconds to leave the building. When you return and open the door � the green LED will light. You then have about 10 to 15 seconds to move SW1 to the �off� position. If you fail to do so � the relay will energize and the Siren will sound. Of course � you can turn the Siren off at any time by moving SW1 to the �off� position.
Because of manufacturing tolerances � the precise length of any delay depends on the characteristics of the actual components you�ve used in your circuit. But by altering the values of R5 & R6 you can adjust the Exit and Entry times to suit your requirements. Increasing the values increases the time � and vice-versa.
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