But if the alarm is rigged so that it turns off whenever the door is closed again ( working along the same principle as the lights in a refrigerator), the thing is of ... The circuits in this section represent three basic kinds of alarm- triggering circuits.
|Title||:||Beginner's Handbook of IC Projects|
|Author||:||David L. Heiserman|
|Publisher||:||Prentice Hall - 1981-01-01|