Mono-stable Multivibrator Circuit Composed of 74HCT221 with Variable Duty Cycle

Published:2011/4/21 20:54:00 Author:Sue | Keyword: Mono-stable, Multivibrator, Variable Duty Cycle | From:SeekIC

As seen in the figure is the mono-stable multivibrator composed of 74HCT221 with variable duty cycle. Capacitor C is charged and discharged at the same rate, with a duty cycle of 50% and its oscillatory period T equals to RC. In figure (a), R can be replaced by what in figure (b) to get othernecessary duty cycles. In this condition, C1 is charged through R1 and discharged through R2. The oscillatory period T is (R1+R2)C/2 and duty cycle equals to R1/(R1+R2) thereabout. In figure 9-11, VD1,VD2,VD3 refer to type 1N4148.



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