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.
We have not build this smoke alarm detector.
5 Comments
what exactly is the chip on board for the above circuit?
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Fire Extinguisher Sales & Service in Las Vegas
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Las Vegas Fire Extinguisher Sales
what is this chip on board in this circuit.....plz explain this
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.
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