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