Give me a design of any electronic deboucing circuit u know.Details below?

Question

For highly sensitive electronic designs, u will notice that a push on the push button does not just bridge or unbridge the circuit.There is always very tiny smaller deminishing bounces that follows.
As an electronic engineer or aspiring engineer what type of push ciruit or deboucing switch can be better use.


Electronic engineering student.

Answer 1

The best debounce circuit for the application you describe is a one shot multivibrator, with the output pulse width set beyond the length of the push button's bounce oscillation time. The 74121 is an excellent choice for this application

Answer 2

For very critical circuits, it's best to use a SPDT push button. Then use each contact to drive the Set and Reset inputs of a Flip-Flop. Make sure to use pull down resistors on the inputs. You're Q and notQ outputs should be clean and bounce free. This will work on TTL and CMOS. Hope this helps you out.

Answer 3

Excellent answers so far but in today's "Computer Age" you just "De-bounce" using software on any input port. Where the "Software" See's a high (or low if the input is normally high) then a "Wait State" is invoked and only if the input is still correct will the circuit react ;-)

Answer 4

You can use a 555 timer as a debounce. There are some interesting links below.