The security alarm system for the farmer

02/28/2017 - 06:28

When I faced need of manufacturing of such device, that, having studied the whole pile of literature, came to a conclusion that any of earlier published circuits completely is not suitable for these purposes. Therefore also it was necessary to be engaged in manufacturing of own system which would possess simplicity, reliability and thus provided protection on one security loop of several removed on distance to 100 m from each other objects. This device can be applied to protection of giving or a garden site.

the Electric circuit of the block of protection is given by font on fig. 3.14. It provides indication of a place of the worked sensor — one of four that increases convenience at its installation and use. To define a place it is possible and on character of a sound of the connected siren or a call.

the Circuit is sensitive to any violations in a chain of a security loop (a gap or short circuit) and allows to simplify considerably connection of objects of protection (see fig. 3.15).


Fig. 3.14. An electric circuit of the block of protection for connection of remote sensors


the Fig. 3.15

the Principle of operation of the block of protection is based by sans-serif on control of level of tension at course of a small current through a security loop (from the worked sensors it changes).

the Circuit is collected by font on easily available elements and consists of a source of a network food on the T1 transformer and VD3 diodes... VD6, a voltage stabilizer on D5 chip (КР142ЕН8Б or 142ЕН8Б), circuits of control of level of tension on a security loop (VT2... VT6) and the shaper of time intervals on D1 chips... D4. to

the Circuit of the shaper of time intervals by a principle of work is similar to font with given on fig. 3.10 and has the insignificant differences connected with use of the K1 relay for inclusion of powerful loading (a call or a siren, light), and also light-emitting diode indication such as the worked sensor.

At turning on of the block of protection (SA1 switch) the circuit provides with font a delay of installation of the PROTECTION mode for 12 seconds in order that the owner managed to leave a room.

At an entrance in the house will work the F5 sensor, and within 6 seconds it is necessary to manage to disconnect the alarm system till emergence of the sound notification.

All circuit in the PROTECTION mode consumes on a chain +25 In a current no more than 10 мА, and at faultless assembly its control consists in installation by the R12 resistor (multiturnaround, the SP5-2 type) the ravine. "1" on VT4 collector, and at operation of F2 or F3 sensors there should be a ravine." About".

the K2 Relay should work font only at short circuit of a security loop (worked the F4 sensor).

Table 3.1

the Condition of a security loop

the worked sensor

the Luminescence of sacred diodes in the protection block

Control points of the circuit

the Target signal on turning on of the K1 relay

of

HL1

HL2

HL3

and

b

with

of

the PROTECTION mode

-

no

no

no

1

1

1

no

of

a rupture of a loop

F1

is

is

no

1

0

1

прерыв. incl. the relay alternates with a neprer.

of

sensor short circuit

F2 or F3

no

no

no

0

1

0

long incl. font>

of

sensor short circuit

F5

is

no

no

0

1

1

long incl. font>

loop short circuit

F4

no

no

is

0

0

0

continuous inclusion

For convenience of control of the circuit is given by sans-serif table 3.1 which allows to understand logic of work of the circuit and indication of the worked sensor.

At production of the circuit are applied by font C1 condensers, SZ, С4, С6 the K10-17a type; С2, С5 — K50-35A on 50 V.Vmesto of transistors VT3, VT5, VT6 it is possible to use a transistor matrix 1НТ251. Hp4.500.000-01 REN34 type K1 relay; К2 — RES55A РС4.569.602 (or РС4.569.607) or RES55B РС4.569.627 (РС4.569.632) on working tension of 12 Century

the T1 Transformer can use any with tension in a secondary winding 18... 25 Century. Such tension is in many transformers from household radio equipment. So many of the unified transformers of type, for example, will approach: ТПП221... ТПП226, ТПП231... ТПП236, ТПП245... ТПП248, ТПП251... ТПП262 and others. They have many secondary windings with different tension, and consecutive their inclusion will allow to receive the necessary.

as F1 sensors... F5 is better to use gerkonovy contacts together with magnets as they are tight and are not afraid of atmospheric influences.

Use of the SA2 switch is not obligatory, but its existence does convenient (silent) check of operation of the block of protection at operation.
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The security alarm system for the farmer

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