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In a digital circuit probably the best way is with a monostable multivibrator, or one shot timer. The length of the timer should be made to be just a little longer than the bounce time of the switch.

Ans2: My favourite is a 2 input NAND gate with both inputs connected to the switch, but with a small RC delay circuit in one of them.

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Q: How do you debounce a switch?
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