security door circuit

This circuit can apply to many hobby project .

An electronic door lock circuit different, which is very simple, and we do not need lots of materials for the UN it is produced. The key to a line of code should be strengthened by the straight line, so you optocupler Enable IC1.

If by mistake and stepped spy who does not belong in combination, then the block is trapped. To recover, we adjust the unit for the block, you must press the switches S1 or S10 for correct the password.

The external reset button S1 is inside and lock the S10,

 The Code of the circuit, it is connected, and IC4022 and can be easily modified by changing the connections in the keyboard switch.

The Q2 BD679 can lead to everything, etc. external circuit relay events, while providing electrical insulation of the circuit due. In addition, the circuit can be powered by a 9V ..

Electronic Part List

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