PBS Switch Debouncing by 555| Circuit Project

This circuit will remove the transient spikes and contact bounces from a non-latching push button switch.

Using a 555 timer as a monostable circuit, it is easy to build a good switch debouncer circuit. There are many circuits for SPDT debouncing, but not many for a normally open, push-to-make press button switch (PBS). The 555 monostable gives an output pulse of around 20 msec with component values shown. The formula for determining the output pulse is:

tout = 1.1 R1 C1

Circuit diagrams and schematics - Electronic projects

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PBS Switch Debouncing by 555