The intruder alarm is applied recently more often. The industry offers its different types. But the alarm system it is possible to make also with own hands. The intruder alarm can be several types. The most widespread type of the alarm system used to protection of the room is the alarm system working for gap.
It is required to you
- The electromagnetic relay with normally closed and normally opened contact blocks
- DC power source - 2 pieces.
- The power switch (toggle-switch) – 2 pieces.
- Lamp from the pocket torch on 4.5-6.3 V
- The variable resistor on 100 Ohms
- Connecting wires
- Sealed-contacts, permanent magnets
- Soldering iron
- Screw-driver
- Combination pliers
- Solder
- Rosin
- Adhesive tape
Instruction
1. Prepare the operating chain. It represents the wire line put on perimeter of the room and covering doors, windows and other ways of penetration into rooms. Wires can be fixed by means of adhesive tape. For the operating chain it is possible to use normal solid assembly wire. In all places of disclosure of doors, windows and other openings install sealed-contacts opposite to which fix magnets so that when closing windows and doors the sealed-contacts have been closed, and when opening – are opened.
2. Prepare the electromagnetic relay. Connect the operating winding of the relay consistently to the toggle-switch, energy source, the control lamp and the operating chain.
3. By means of the variable resistor carry out adjustment of the relay so that when opening one door or one window of the relay worked and contacts of its executive part were disconnected or became isolated. It is possible to connect the sound alarm system to normally opened contacts of the relay – buzzer, "howler" or any other alarm device with own energy source (inclusion is conducted consistently). Connect the signal lamp with the power supply battery to normally closed contacts of the relay. Burning of this lamp will mean that the alarm system is switched-off. For economy of power supply in this chain it is possible to put the additional toggle-switch.