How to make password?

How to make a password:

This is a circuit to make a password. this is the best easy security system. 6 digit. here used 6 changeable switches to make 6 separate numbers. sometimes we need easy security then we can use this system. 

transistor circuit diagram of 2sa1943 and 2sc5200

Build a Transformer or construct the transformer. Home Theater Circuit Diagram 5.1

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