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Fire Alarms Circuits
Last Updated on: Monday, October 03, 2011 06:07 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Fire Alarm -  This circuit warns the user against fire accidents. It relies on the smoke that is produced in the event of a fire. When this smoke passes between a bulb and an LDR, the amount of light falling on the LDR decreases.  This causes the resistance of LDR to increase and the voltage at the base of the transistor  [Radioland.nt.au]


           
 
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