Anti Theft Alarm
This anti theft circuit uses timer IC 555 to produce the sound. The alarm will keep “silent” when the thin wire is connected the pin 4 of IC to the ground. When the thin wire is broken, the alarm will set to “crying”…
This anti theft circuit uses timer IC 555 to produce the sound. The alarm will keep “silent” when the thin wire is connected the pin 4 of IC to the ground. When the thin wire is broken, the alarm will set to “crying”…