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Double-digit display seconds timer circuit diagram

2016-12-15 09:46  
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Double-digit display seconds timer circuit diagram
Double-digit display seconds timer(5G5544、CD4511、CD4518) circuit diagram is shown as above. The maximum time timer of explicit two-digit seconds is 99s. The circuit is composed of a time-base signal which is quartz clock IC 5G5544 output pulse signal. Since the pulse period of circuit output is 2s, it achieves the seconds output functionby matchingwith transistor VT and two input ends of the counter.