To debounce a soft switch

[kmj]

Hi, I got this soft switch from a friend and since I needed three for my system I put them together. The problem is that they bounce something terrible. My undeducated guess is that the NE555 sences the pulse from the switch and then "tells" the transistor to activate the relay. The bouncing is due to the fact that the little chip reacts to every litte disturbance it comes across and the solution is to make the NE555 ignore shorter pulses and just react to some more firm ones.

So, am I right and if so, how do I do it?

The circuit I used is attached and I hope that it is OK to post it. Since I don't know where it came from I can't ask.

 

[stoN_Cold]

Hi kmj!

Try this, work 1000%.

Regards zeoN_Rider

 

[kmj]

that looks easy enough.

I can use the transistors I have at hand I suppose?

The cd4014, that is a dual flip-flop, right?
This one

 

[stoN_Cold]

Hi kmj!

CD4014 is 8-bit static shift register.

Regards zeoN_Rider

 

[gootee]

Re: Hi kmj!

CD4014 is 8-bit static shift register.

Regards zeoN_Rider

I guess he meant to ask about the CD4013 that is in your schematic.

 

[kmj]

oh, thats right. My mistake
4013 it is

 

[stoN_Cold]

Hi!

I, don't know what he meant.

Regards zeoN_Rider

 

[stoN_Cold]

Hi!

That is better!

Regards zeoN_Rider

 

[audiosteve]

Check out this simple latch circuit. It will insure a perfectly debounced state on the output at all times. Any metastate due to switch bounce will leave the output in its last state. Follow the logic and you will see.