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

    20W Car Booster Audio Amplifier
    Water-Level Measurement Circuit
    S1Ngle-Ic Logic Probe
    DIY IRF610 MOSFET Class-A Headphone Amplifier Project
    Soft Light Dimmer Circuit
    theremin bamttech
    NTC phase asynchronous motor protection circuit
    1200 to 6000A-10V three-phase thyristor power regulator circuit plating
    555 capacitor filter circuit diagrams



    Top