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AT89C2051/4051scanning 7-segment display and keypad (2N2907)

2016-12-10 13:19  
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This article describes the AT89C2051/4051scanning 7-segment display and keypad (2N2907). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: 2N2907. 

7 seg1 AT89C2051/4051scanning 7 segment display and keypad