Abstract: The circuit by two-four D-type flip-flop latches 4508 default password composition of the circuit, from 42 different input and the 4070 two-door or four-door 4072 or enter password to verify the composition circuitry from 555 one-timer component stability Trigger-lock relay drive circuit, by the count decimal / distributor 4017, the importation of non-door 4011, signal generator, the composition of the alarm buzzer circuit. By 4508,4070,4072,555,4017,4011 the pin function, the truth table, and the schematic design, electronic circuitry and computer simulation study of electronic technology allows more simple and intuitive. Now the electronics design and manufacturing process can not be separated from the computer's help, this will be multism8, protel99se, and other electronic simulation software to achieve the PCB and PCB Rendering map.
Key words: electronic locks control circuit multism9 simulation protel99se