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Countdown display timer circuit with NE556, CD40110

2016-12-05 17:30  
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Countdown display timer circuit with NE556, CD40110
Digital display countdown timer can make people always see how much time left, it has certain practical value to some applications. As shown in figure, itis a digital display timing circuit, its structure is simple, and is easy to make. Its time-base unit adjustable. This circuit uses harmonic oscillator, which is composedof NE555 circuit as time base. Although the time precision is not quite high, it is economical and suitable. Full circuitis composedof adjustable time base signal generator, minus count, display and output signal control circuit etc.