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Four Basic Circuits of 555 Monostable Trigger

2015-01-28 05:06  
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Four Basic Circuits of 555 Monostable Trigger
The circuit in the picture 2-8(a) is a typical monostable circuit. When external pulse is added to pin 2 of 555 via differential circuit C1 and R1, positive pulse will force 555 to set, temporarily stable pulse width that pin 3 outputs td is 1.1 RC. Circuit in picture (b) has two output terminals. C discharges through R, and it takes longer for it to recover than that of (a). Pin 2 and 6 in circuit of picture (c) joint a positive pulse, temporarily stable pulse is negative and the width is 1.1RC. They can output two circuits simultaneously. Circuit in picture (d) has a faster charge ratio and higher work efficiency and can output two circuits simultaneously