Security device based on the simulator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Security device based on the simulator. 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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The scheme of the security device is shown in fig. one.

(click to enlarge)

Since the majority of unauthorized intrusions in dacha cooperatives are committed at night, the device controls the inclusion of loads at this time. On the DD1 chip, a pulse generator with a repetition rate of 30 minutes is made. For this, elements of the microcircuit generator itself (pins 12-14) and divider counters (pins 5, 6, 7, 9, 10) were used. On microcircuits DD2, DD3 two decade counters are made. A photorelay is assembled on the DD4 chip and the photoresistor R3. Diodes VD3 - VD10 together with logic elements DD5.3, DD5.4 allow you to program the on and off times of the loads connected to the sockets XS1, XS2.

Loads are connected to the network using triacs VS1 and VS2, controlled by the contacts of electromagnetic relays K1 and K2. The power supply of microcircuits and relays is assembled according to the traditional scheme with excess voltage damping by a capacitor, it uses elements C4, R11, VD1, VD2, C5.

Assume that the device is connected to the network and the photoresistor R3 is illuminated. At the same time, its resistance is relatively small, and at the junction point of resistors R3 and R6 there is a voltage greater than the switching threshold of the Schmitt trigger (logic elements DD4.1, DD4.2). At the output of the DD4.2 element, the voltage is logical 1. and the counter-dividers of the DD1 microcircuit, as well as the DD2, DD3 microcircuits, are inhibited by applying this level to the R inputs. all pins of connector XS0 - logic 3 voltage.

At the onset of the dark time of the day, a logic 0 voltage appears at the output of the Schmitt trigger, the generator and counter-dividers of the DD1 microcircuit, as well as the DD2, DD3 microcircuits, begin to work. Every 30 minutes, the logic 1 voltage appears on the next pin of the XS3 connector. Through diodes VD3 - VD10. which, using flexible conductors and plugs XP1 - XP8, are connected to the socket-contacts of the XS3 connector, the logic 1 voltage is supplied to the inputs of the logic elements DD5.3 and DD5.4. In this case, the electromagnetic relays K1 and K2 are activated, with their contacts including the corresponding triac (VS1 or VS2), which connect the load to the network - lighting devices and audiovisual devices. The program for switching on these devices is set by inserting the XP1 - XP8 plugs into the corresponding sockets of the XS3 connector.

Elements R9, R10, C2, C- are designed to reduce the burning of the relay contacts. Diodes VD11, VD12 protect transistors from inductive voltage surges that occur when the relay is turned off.

The following types of radio components are used in the device. Chips DD2 - DD5 can also be from the K561 series. Transistors VT1, VT2 - any of the KT203, KT208, KT209, KT361, KT502 series. Diode bridge VD1 - any for a voltage of more than 10 V and a current of more than 50 mA. The zener diode may be of another type, designed for a stabilization voltage of 9 V (for example, KS 191 A). Diodes VD3 - VD12 can be almost anything - D9, KD102, KD103, KD509, KD510 with any letter indices.

Capacitors C2 - C4 - type K73-17, C5 - K50-24, K50-29 or K5-16, C6 - KM-6, K10-17 or any other type. Capacitor C1 determines the stability of the time intervals generated by the generator, so it is desirable to use types that have a small temperature coefficient of capacitance (TKE). You can use ceramic capacitors of types KT, KD, KLS, KM, K10-17 with the following subgroups for TKE: P100, P33, MPO, M47, M75, as well as film capacitors of types K73, K74, K77

All fixed resistors - MLT, S2-23, S1-12; tuning R7 - multi-turn SP5-2 or SP5-14. Relay K1, K2 - type RES49, passport RS4.569.424 (winding resistance to direct current 800 Ohm). Sockets XS1, XS2 - type RD1-1, XS3 - socket of the MPN44, GRPM45 connector or similar. Plugs XP1 - XP8 are made of a wire of suitable diameter (a tight insertion into the female part of the connector must be ensured). The plugs are connected to the anodes of the VD3 - VD10 diodes using flexible conductors (for example, from wires of the MGTF, MGSHV brand).

Installation of the device is optional. The photoresistor is positioned in such a way that natural light from the street falls on it and light from the lanterns does not fall on it. Setting up the device consists in selecting the Schmitt trigger threshold using resistor R7 when the illumination level decreases to a certain limit. You should also install the plugs in the appropriate sockets of the connector.

In order for both loads to be turned on and off independently, the contacts of the connector socket should be combined in pairs, then two plugs that control different loads can be "tied" to the same time interval. If it is necessary to increase the number of time intervals, the number of forks can be increased.

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