Simple security devices for apartments and cottages. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Simple security devices for apartments and cottages. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling

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At present, the industry still produces few security devices for apartments, and their price does not always correspond to the parameters. The circuits published in various magazines are designed, as a rule, for experienced radio amateurs, and not everyone will be able to repeat them.

The proposed two schemes differ from all previously published ones in their simplicity and reliability, which has been verified in operation for more than 10 years.

The basis for constructing the circuit (Fig. 3.6) is the use of a time relay K2 of the RVP72-3-221-ОУ4 type, which has two groups of contacts, one of which - K2.1 - works instantly, and the second - K2.2 - with adjustable (0,4 ,180...6 seconds) delay. The delay is set to 8 ... 3 seconds so that when entering the apartment, the owner has time to turn off the alarm (secretly installed with the S1 button) before the sound signal sounds. Complete disconnection of the alarm from the network is performed by the toggle switch S1 (type T3 or T4). The door position signal sensor is the S2 button (KM1-2 type or similar small-sized one) installed on the door frame. Button S1 is installed in front of the door to the apartment (possibly close to the bell button), and it allows you to switch the alarm to ARM mode after leaving the apartment. Relay K220 can be used of any type with an operating voltage of XNUMX V.

In the ARMED mode, the circuit does not consume electricity, but when the alarm is triggered, the siren (or bell) will sound until the alarm is turned off by the S3 button or the S1 toggle switch inside the apartment.

Simple security devices for apartments and cottages
Rice. 3.6. Electrical diagram of the apartment security device:

S1 - turn on the alarm toggle switch (T1 or TK);

S2 - button for turning on the "Protection" mode;

S3 - button to disable the "Protection" mode;

S4 - button for the alarm contact of the guard installed on the front door (sensor)

Such an alarm cannot be installed in a country house or in a place where you have to visit very rarely. To eliminate this drawback, the circuit can be supplemented with another short-circuit time relay, similar to K2 (shown in the diagram by a dotted line). The response time of KZ.1 contacts is set to a delay of 180 seconds. After this interval, the circuit will turn off the siren and will remain in this state until the ARM mode is activated.

Simple security devices for apartments and cottages
Rice. 3.7. Electrical diagram of a summer cottage or garage security device:

S1 - toggle switch for turning on the alarm;

S2 - the toggle switch is used to temporarily turn off the call (or siren) while monitoring the operation of the security device

The second scheme shown in fig. 3.7, has a limited signal sounding time (no more than 180 seconds) and is performed on only one time relay.

The circuit will enter the ARMED standby mode after a short-term de-energization of the circuit, after operation, or upon initial switching on.

The use of a thyristor VS1 in the circuit is necessary for fire and electrical safety (at the same time, there will be no life-threatening voltage on the circuit of security sensors). The circuit allows you to connect many sensors in series in the security circuit. A sensor is installed on the window glass in the form of a strip of metal foil glued around the perimeter. Such sensors are also used at some industrial facilities and are triggered when glass is broken.

When the security circuit is broken, relay K2 will turn on (the same as in the diagram shown in Fig. 3.7) and its contacts K2.1 will self-lock. Relay K1 will also start to work, which will turn off after 180 seconds with contacts K2.2.

Relay K1 allows you to turn on a powerful load. As a sound source, you can use the SS-1 siren or any strong bell.

When replacing a thyristor with another type (KU201L), selection of R1 may be required. Resistor R1 is chosen of the PEV-10 type or similar with a permissible power of 7 ... 10 W (it can be made up of several series-connected resistors).

Bulb HL2 and toggle switch S2 are auxiliary and their use is not necessary.

A common disadvantage of the above schemes is the dependence of the security system on the 220 V network, but, given the low probability of the circuit being de-energized at the very moment of the robbery, they can reliably protect objects.

Publication: cxem.net

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