DESIGN AND CONSTRUCTION OF A TIME LOCK
ABSTRACT
Nowadays various kinds of code locks are available in the markets which are very costly. The Code lock described here is an electronic combination lock which can be used in daily life. The circuit is described here has following main advantages: You can use 16 switches or more to make it more confusing and people will think you have used a microprocessor, there is no need to amplify signals hence no need of transistor, low cost and small in size and switch has to be pressed in specific interval of time to open the lock.
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