The timing circuit composed of the 555（ICM7555）of CMOS

Published:2011/6/25 21:32:00 Author:qqtang | Keyword: timing circuit, 555 | From:SeekIC

In the figure is the timing circuit composed of the 555（ICM7555）of CMOS, as CMOS is used, the impedance is very high, therefore, the amplitude of the time can be expanded largely, for example, it can compose a timer of several minutes. Here, figure (a) is the simple timing circuit. In Figure (b) is a timing circuit which can set the time of 10~100s, in the circuit, to use to differential pulse trigger, the capacitor C1 is used for coupling, only when the voltage of 2-pin is lower than 1/3 of the power supply is the trigger motivated. The time is decided by C3 and R4＋RP1.



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