Remote Alarm For Smoke Detector circuit


Posted on Feb 6, 2014

This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete isolation from the mains so that low-voltage (12V) cabling could be run to the alarm circuit which is located inside the house. In operation, the alarm signal (I) from the smoke detector is rectified using bridge rectifier BR1 and then fed to optoiso lator OPTO1 via resistor R3. This in turn drives the gate of SCR1 which turns on and activates a piezo siren with inbuilt oscillator..


Remote Alarm For Smoke Detector circuit
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    PCB Exposure Box with Countdown timer (ATMEGA8)
    Low-distortion 1.6-30mhz ssb driver
    Booster Amplifier For Car Stereo Use Circuit
    Ultrasonic Mosquito Repeller Circuit Using CMOS IC
    lm317 variable power supply circuit project
    schematics Buck switching regulator based on ATtiny84a -- please critique!
    1KHz Square Wave Generator Circuit
    Proximity Detector Circuit Using NE555 PCB
    planning build mosfet h bridge motor control
    easy and cheap cdv 700 tube adapter
    Input programming activity
    Miniature DC Motor Speed Control circuit
    IC OCL power amplifier circuit



    Top