Two-Zone Burglar Alarm


Posted on Feb 6, 2014

This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for the Beginner`s Guide To Cmos Timers. So it has a particularly detailed circuit description. There`s an optional One-Time-Only module. It will force the siren to switch off after the first ten minutes - and prevent the alarm from activating a second time


Two-Zone Burglar Alarm
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Lowpass filter has improved step response
    Headphone Amplifier
    Digital code Lock with AT89C2051
    60 LED Clock
    the monitoring systems of railway level crossing of mining area of Atmega128 one-chip computer and GPRS
    How to make an Astable or Free running Multi vibrator using 741 Op-Amp
    555-Circuits
    TV Decoder
    AN7522 circuit diagram
    2x150W no large loop feedback hi-fi amplifier



    Top