Home Sensor Smoke detector circuit

Wednesday, April 13, 2011

Smoke detector circuit

Published

This causes the resistance of LDR to increase and the voltage at the base 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.
We have not build this smoke alarm detector.

For smoke detector installation and maintenance use a near electrician.

5 comments

  1. AnonymousWednesday, August 17, 2011

    what exactly is the chip on board for the above circuit?

    ReplyDelete
  2. AnonymousFriday, July 12, 2013

    Thanks for sharing the information. I found the information very helpful. I really like this post.

    Fire Extinguisher Sales & Service in Las Vegas

    ReplyDelete
  3. UnknownThursday, July 18, 2013

    Thanks so very much for taking your time to create this very useful and informative site. I have learned a lot from your site.

    Las Vegas Fire Extinguisher Sales

    ReplyDelete
  4. UnknownTuesday, December 17, 2013

    what is this chip on board in this circuit.....plz explain this

    ReplyDelete
  5. Sam SmithWednesday, July 03, 2019

    It can also be a correlation to what the metal detector cost. waterproof metal detector Metal detectors can effectively penetrate through soil, wood and other non-metallic materials.

    ReplyDelete

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