|
Fire Alarms Circuits
Last Updated on:
Friday, March 12, 2010 12:07 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 is pulled high due to which
the supply to the COB (chip-on-board).... (added 8/06) |
|
|
|
|
|
|
| |
|
|
