2B-CAR COMBINATION LOCK
———————- This project is a multi purpose project. You can use it as a multi purpose security lock. The special feature of this project is that the lock opens only when the correct number is dialed. It can also be used as a puzzle game.
TECHNICAL DESCRIPTION AND WORKING
This project has been developed and successfullu tested O.K at TV Engineers Technical Lab.
You will need four pieces of IC 555 and one piece of IC CD 4017. The age of electronics is such a project. This project will as to rish the people who are leprived of knowledge in electronics. This combination lock can be used for your family can only open the door without using the calling Lea or making any raise. But a stanger cannot open the lock. The IC 555 has been used in the circuit as a timer. Four such ic s have been if the push switches are not pushed in determined order because the gate pulse will not be available. Only when the switches are pushed in order and with in an interval of 3 seconds the last output will be available. The time interval can be adjusted. The project is a useful one when are pushed S1, the output pulse beomes available at pin No 3 of related IC 555 and just after this,if we press S2,the output pulse becomes available on of othe IC our fixed time and the series continues upto the last IC CD4017. The output at pin No2 IC 4017 brings the relay to ON position.
PRECAUTIONS WHILE ASSEMBLING
1.First of all, check the components as per the circuit.
2.Properly check the transistor BC 148
3.Avoid short circuit while soldering
4.Use IC base for mounting IC
LIST OF COMPONENTS
Type from T OK FP VOL -2