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本电路的定时范围有0.6秒～5.5分钟和2.5秒钟～23小时两挡供选择。如图所示,电路的核心是SGS—Thomson公司生产的4536型定时器专用集成电路(IC1)。该IC内含24级串联的二进制分频器,可将输入信号的频率除以2~(24)。当输入信号加到⑥脚时,内部的24级分频中有8个不工作,除数即可减小到2~(16)。 该IC内部具有振荡器,其振荡频率由接在④、⑤脚的C1、R1决定,振荡信号经R2和③脚送入内部的分频器。A、B、C、D端的输入电平决定哪些分频器被接到输出端。例如,当S1的5只开关全部开路
The circuit timing range of 0.6 seconds to 5.5 minutes and 2.5 seconds to 23 hours two blocks for selection. As shown in the figure, the heart of the circuit is the Model 4536 Timer IC (IC1) manufactured by SGS-Thomson. The IC contains 24 cascaded binary dividers that divide the frequency of the input signal by 2 to 24. When the input signal is added to pin 6, 8 of the 24 internal dividers do not work, and the divisor can be reduced to 2 ~ (16). The IC has an internal oscillator, the oscillation frequency by the ④, ⑤ feet C1, R1 decision, the oscillation signal through R2 and ③ feet into the internal divider. The input levels at A, B, C and D determine which crossovers are connected to the output. For example, when all 5 S1 switches are open