Editing Switch (section)

==== Debouncing ====
[[File:TS contact bounce filter.svg|thumb|right|SPST switch bounce filter using a [[Schmitt trigger]] and capacitor]]
The effects of contact bounce can be eliminated by:
* Use of [[Mercury-wetted relay|mercury-wetted contacts]], but these are now infrequently used because of the hazards of mercury.
* Alternatively, contact circuit voltages can be [[low-pass filter]]ed to reduce or eliminate multiple pulses from appearing.
* In digital systems, multiple samples of the contact state can be taken at a low rate and examined for a steady sequence, so that contacts can settle before the contact level is considered reliable and acted upon. See {{Section link|Keyboard technology#Debouncing}}.
* Bounce in [[#Contact terminology|SPDT]] ("single-pole, double-throw") switch contacts signals can be filtered out using an [[Multivibrator#Bistable|SR flip-flop]] (latch) or [[Schmitt trigger]].
All of these methods are referred to as 'debouncing'.