Smoke Detector Circuit


Posted on Feb 5, 2014

It relies on the smoke that is produced in the event of a fire and passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This type of circuit is called optical smoke detector. Do not use it as a home smoke detector it`s jus for electronic projects. This causes the resistance of LDR to increase and the voltage at the b


 Smoke Detector Circuit
Click here to download the full size of the above Circuit.

ase of the transistor is pulled high due to which the supply to the COB (chip-on-board) is completed. The sensitivity of the smoke detector depends on the distance between bulb and LDR as well as setting of preset VR1. Thus by placing the bulb and the LDR at appropriate distances, one may vary preset VR1 to get optimum sensitivity.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Atv Jr Transmitter 440Mhz Circuit
    syntha vcf historical
    Voltage Level Translator
    Proximity detector electronic project circuit design
    Photoflash
    FM Transmission and Reception



    Top