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本电路可任意设定100小时内以1小时为步进的定时周期,定时周期一到便自动切断负载。采用常用振荡器芯片和十进计数器芯片。4060为自带二进制分频器的振荡器芯片,每小时送出一脉冲,送到IC2(14)脚,进行第一次十进计数,每小时在(11)、③、……各脚依送出高电平。每隔10小时,IC2(12)脚送脉冲至IC3(14)脚,进行类似的十进计数,使相应的输出端子每隔10小时依次送出高电平。定时周期可由用户用S2和S3两只十档开关进行预置,送到与非门IC5(a)。当达到预置时间后,IC3(a)两输出端均为高,输出为低,于是7555定时器输出③脚为低,T1截止,继电器释放,负载切断。同时,③脚低电平信号经反相器
The circuit can be arbitrarily set within 100 hours to 1 hour for the timing period, the timing cycle to automatically cut off the load. Using common oscillator chip and decimal counter chip. 4060 comes with a binary oscillator chip oscillator, send a pulse every hour, sent to IC2 (14) feet, the first decimal count, every hour in (11), ③, High level. Every 10 hours, IC2 (12) sends a pulse to IC3 (14) pin, making a similar decimal count, so that the corresponding output terminal in turn sent high every 10 hours. The timing cycle can be preset by the user using two ten-position switches S2 and S3, to the NAND gate IC5 (a). When the preset time is reached, the IC3 (a) outputs are both high and the output is low, so the 7555 timer output pin is low, T1 is off, the relay is released and the load is cut off. At the same time, ③ pin low signal through the inverter