How to build a practical Burglar Alarm using a Cmos 4001. It will sound it's Siren once - for a preset time period - and then switch off. It has independently adjustable Exit, Entry and Siren Cut-Off timers.
How To Connect The Expansion Modules
The One-Time-Only Alarm has a range of Simple Expansion Modules that allow you to add any number of Alarm Zones, Personal Attack Zones and Tamper Zones to your system. There's also an Untimed Output Module. It will keep an internal sounder, strobe-light, lamp or whatever going after the siren has stopped.