A four digit code lock project allows the uses to open the door or ignition of car with in specific time delay. A wrong password will lock the keypad. This multiple IC-555 based digital circuit is very innovation idea..This is a complete, assembled working project / model (duly tested) at our work shop. This is a handmade project on a general purpose PCB and uses Electronics / Electrical components as per requirement of a particular model. A rough report & study material related to project will be mailed to student on request.
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