The coded lock on tiristor

03/07/2018 - 17:03

At installation of the coded lock not always is available possibility to locate the push-button panel near the management circuit. In this case application of tiristor as triggers remembering the correct combination on an abusive code provides higher noise stability and resistance to deliberate damage in comparison with circuits collected only on KMOP chips.

the circuit Provided on rice 2 20 allows to limit to font access to a room of strangers. For operation of an electromagnet of YA1 opening a latch it is necessary to gather in a certain sequence a code from 4 figures (from 10 possible).

Works with font the circuit as follows. In an initial condition on an entrance of management D1 1/6 via the R12 resistor the ravine 1 arrives and the internal key of a chip will be closed. The pressing of buttons in sequence of S4 S3 S2 S1 will lead to serial opening of the corresponding tiristor of VS4, VS3, VS2, VS1. Via R8 R10 resistors the worked tiristor allow to hold in the included condition a current. And if at a set of number any other button it is wrongly pressed will lead to key operation on an element D1 chips. 3 that will provide emergence the ravine 0 on D1 entrance. 1/6 — the key will be opened and the partially correctly gathered code will be dumped .

At the correct set of number will appear a current proceeding via R6 R7 resistors and the VT1 transistor will open. A food on YA1 electromagnet will move thus. And that the electromagnet was not energized in that a cheniye of a long time after operation the element D1. 2 together with a chain of a charge of the R11 C1 condenser allows to limit duration of its work to an interval 24с. Time is defined by face value of the C1 condenser. As soon as tension on an entrance D1 2/12 in the course of a condenser charge


Pис. 2.20. Элeктpнчecкaя circuit of the coded lock


Fig. 2.21. Circuit of replacement of the VT1 transistor


Fig. 2. 22. The topology of the printed-circuit board and arrangement of elements

will reach a threshold of operation of a key, it will submit the ravine '0" on D1.1 management that will transfer all tiristor to an initial condition .

the Device can work with p at change of feeding tension in wider limits than it is specified on the circuit but its size gets out proceeding from necessary for reliable operation of an applied electromagnet. At control of the circuit selection of face values of the R7 resistor and the C1 condenser .

the VT1 Transistor has big factor of strengthening and can be replaced by two usual included according to the circuit shown on fig. 2. 21. Tiristora can be used with any last letter in designation. Condensers are applied К50 35 on working tension 40 In, and resistors on will reach any .

the SB1 Button is used by p for remote opening of the lock indoors and font> should be calculated on a current 3 And


Fig. 2. 23. Connection of the replaceable kodozadayushchy X2 tip

All elements of the circuit except the transformer, VD5 VD8 diodes and YA1 electromagnet, are located on the unilateral printed-circuit board, fig. 2. 22.

For convenience of change of a code and connection of chains from buttons of a set of number on a payment are established to font by p M2,5 screws (as it is shown in drawing) to which fix the necessary wire. If to establish the additional 16 contact I will corrode (Х2, fig. 2. 23) with the replaceable kodozadayushchy tip, change of a code will take some seconds (if in advance to prepare the tip with the established crossing points under the necessary combinations of figures of a code) .


Pис. 2. 24. The circuit of restriction of time

One of elements of a chip is not used by font and with its help it is possible to execute restriction of necessary time on a code set that will in addition complicate code selection. The example of option of such connection of D1.4 is shown on fig. 2.24 .
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The coded lock on tiristor

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