Electric shock debounce circuit

In mechanical contact switches
, jitter will occur when the contacts are closed or opened, making the switch state very unstable at
the moment of action. If it works in counting
mode or as an interrupt input, it will cause the system to work
abnormally, so , it is necessary to use contact debouncing
. The picture shows a debouncing circuit using timer 555 . The output of timer 555 is used as the clock of the D flip-flop, and the D terminal of the D flip-flop is connected to the input. The 555 works in a monostable flip-flop mode . When the contact is closed or opened, the 555 will be triggered to generate a pulse width. T=0. 632RC rhyme pulse, as long as the pulse width is greater than the contact jitter time, the same state as the input can be obtained at the output end of the D flip-flop. No jittery signal.