Description: Design is a digital safe lock control circuit. First, the main problem is security, that is unlocking the password is likely to crack as small as possible followed by ease of operation, unlocking procedure but in the complex. There are also some special requirements, such as preset and change the password, enter the wrong password several times should start alarm system, the user dialed the wrong number dial the number when the original clear redial, segment display, etc..
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coded lock.doc
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