Microless
electronic lock
All electronic locks that are designed today contain a microcontroller to manage the system. If there is not a microcontroller the lock is made using switches strangely connected together... In this project, I'm not wishing to challenge a microcontroller lock but it is shown how, using the series 74xx IC, is possible to make an electronic lock with interchangeable code, error counter and keyboard blocker!
PDF article with all the project technical information