Security Lock | Door Security Electronic Key Combination Lock

This is a relatively simple circuit of electronic lock of safety with code of 7 digits. It should is given attention in the time that will be stepped the keys, that shape code and it does not exist it delays. With the right step of keys and if code is right then is activated exit Q7 for roughly 4 seconds, driving the transistor Q2, which with the line can drive one relay, for the opening of door, or any other circuit.

 

With LED D we can have optical clue of activation. The code of circuit, as it has been given have been:1704570 but can change, if we change the connections between in the exits of IC1 and the switches.

 

Parts List :
   R1-7=4.7Kohm
    R8=15Kohm
    R9=1Mohm
    R10-13=10Kohm
    R11=100ohm
    R12=220Kohm
    R14=1.2Kohm
    C1-3=100nF 100V
    C2=4.7uF 25V
    D1-2=1N4148
    D3=RED LED 3mm
    IC1=4022
    Q1=BS170
    Q2=BD679
    S1-10=Push button or keyboard