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The main principle of this circuit is that the door lock opens only when the buttons in series are pressed at a time. We can use it to lock the doors and for other security purposes. This article ...

What are Meta Lock Codes and their importance? Meta Lock codes give rewards in the game, like extra spins, to make the Roblox Meta Lock better. These codes give players important virtual money that ...

This simple code lock circuit described here is of an electronic combination lock for daily use. It responds only to the roght sequence of four digits that are keyed in remotely. If a wrong key is ...