alarm door bell circuit using ne555 part 1


Posted on Feb 6, 2014

The main part of this doorbell circuit are two NE555 timer ICs. When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1.


alarm door bell circuit using ne555 part 1
Click here to download the full size of the above Circuit.




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