555 Monostable mode.

 

1) Does nothing until a low pulse is applied to trigger (pin 2). Low pulse is usually provided by connecting to ground via a switch or transistor.

2) Output goes high for duration set by R1C time constant.

3) R1 should be between 10k and 14m.

4) Timing cap C should be between 100pF and 1000uF.

5) R2 pulls trigger high to prevent false triggering.

6) Uses - One shot timers, switch debouncing.

 

 

 

 

 

 

 

 

 

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