Parameter features: supply voltage 4.5-18V; supply current 3-6 mA; output current 225mA (max); rise/fall time 100 ns; NE555 has a wide range of functions, but is generally used in monostable multivibrators (Monostable Mutlivibrator) and Astable Multivibrator.
The alarm circuit shown in the figure consists of two NE555 timer ICs. When the switch K1 is closed, the first NE555 will give an alarm signal after a delay of about 20 seconds, and the second NE555 will cause the alarm to only sound for 60 seconds. The 20-second delay has two uses: the first is to let the thief be fooled in order to capture him indoors, and the second is that the owner has enough time to enter the house and press the manual reset switch to return the alarm to the initial state without issuing an alarm. signal.
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