security door key 1

�� 7 ��. �� , �� . �� Q7 �� 4 ��, �� Q2, �� , �� , � �� . �� LED D �� . � �� , �� :1704570 �� IC1 �� .

It 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.

	Part List

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