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Electronic Combination Lock(2N3904)

2017-01-08 19:22  
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This paper introduces the Electronic Combination Lock (2N3904). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, you can better grasp this principle. In this circuit, you can learn about and purchase these components: 2N3904.

This circuit is very basic to build. To open a the lock which is connected to the K1 Load you must press each momentary switch in the correct sequence. The sequence used in this circuit is S1,S2,S3,S4. If any of the other switches are pressed the circuit will reset and you will need to start over. Depending on how you wire the switches, you can use any 4 switch combination.

Figure:1

Figure 1 

 

 


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