Basic timing circuit diagram formed by NE555

Published:2011/8/27 1:33:00 Author:Nancy | Keyword: Basic timing | From:SeekIC

Figure 1 is the basic timing circuit diagram formed by NE555. Figure 1 (a) is the basic timing circuit diagram formed by NE555. In the circuit, if a trigger pulse is added to the pin 2 as shown in the figure 1, then there must be a certain time interval pulse in pin 3 output, the interval is T ~ RC, which is amplified by VT1 to drive the light-emitting diode LED in the related circuit in Figure 1. Figure 1 (b) is the timing circuit formed by CMOS (ICM7555). It adopts CMOS and has high impedance, the setting time can be greatly extended, for example, it can be used in the timer of a few minutes. In the figure, R is ranging from lkΩ to lOOMΩ, C is ranging from 1OOpF to 10000μF.



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