A simple alarm system with your own hands is available for repetition to every novice ham radio. In this video, three fundamentally different signaling schemes are considered. The first variant of the signaling allows you to determine the movement of an object, for example, opening a door or window. For this, the reed switch is used. The second alarm scheme is triggered at a given level of illumination. For example, the siren sounds are heard if it is light or dark. It uses a photoresistor and an electromagnetic relay. The third signaling scheme combines the two previous schemes. It reacts to the opening of a door or window only at a certain level of illumination. For example, if the door is opened in a light time, then the siren is silent, and as soon as it becomes dark and the door opens, the alarm will work.
The siren is assembled on two NE555 chips, and a low-power speaker is used as a loudspeaker. It is also possible to connect a powerful speaker, but for this you need to use a transistor switch.
Alarm, self-alarm, alarm circuit, siren
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Негізгі бет Ғылым және технология A simple alarm system with your own hands
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