Domestic Seismic Alarm


Posted on Feb 7, 2014

When the switch is on, the seismic alarm isin detection condition. When there is no earthquake, IC1`s pin 3 outputs low level and VT is disconnected. The alarm circuit does not work. When there is an earthquake, the magnet will move vertically. When it is away from IC1, IC1`s pin 3 outputs high level and VT is connected. HL is illuminated. IC2 and


Domestic Seismic Alarm
Click here to download the full size of the above Circuit.

IC3 begin to work. When the sound signal output by IC2 is amplified by IC3, BL will make an alarm sound.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Power-consumption-limiter
    Gain-Controlled Amplifier
    Mains-Powered Timer
    Interfacing High Power Load to Logic Level with Optocoupler
    Detection systems in PET
    making of wireless car
    40w no tune amp
    2G—22W Stereo Car Audio Amplifier schematic diagram
    Simple Audio Amplifier Circuit Using LM386 PCB
    Interfacing to Sony Cameras
    Tesla Coil
    Digital Lock Project
    Battery over-discharge protection circuit diagram



    Top