There is such a small thing as a sound system, in other words, a piezoelectric switch.This small unit weighs only 80 grams, in his unit there is absolutely nothing complicated, so it can be applied in the protection of their possessions.

level of noise that makes this device is 110 decibels.For those who do not know these figures are jet engine noise.Simply put, it is very loud.The principle of burglar alarms is as follows: the limit switch is installed at the front door, it will be either a mechanical or magnetic, but it is necessary that there was a well-closed contact.This element will serve as a siren, which responds to opening the door.

Outdoor or indoor siren is installed, it is best to place it in a protective cage.Y

ou also need to go through the elements of the two-wire cable connections.Power is connected to the step-down transformer 220 to 12 volts.With the door closed normally closed contact switch is operated so that current flows through it, which powers the device.The signal is in such a position is not supplied, so the siren operates.

When you open the door comes open circuit that feeds the device, so the closed power contacts alarms.The device starts to emit loud noises.If a thief sneaks into the house, where a very loud alarm sounds, it will attract the attention of neighbors and others, very frighten enemies.If no one is around, the siren would not allow attackers to long in the room as the sound is almost unbearable and they will quickly leave the building.

thus looks simple security system.Even if the compromised integrity of the cable that goes from the limit switch relays, the system will still work.If the electricity is switched off throughout the building, this burglar alarm will be useless.

Of course, this system can not be considered fully effective, but for a small country house, it will do.In addition, the installation does not require any specific skills, you just know the basic things and be able to apply them in practice.