JK Flip Flop and Schmitt Trigger

[Blumpkinson]

I am trying to uses a JK flip flop to convert a momentary button to a latched button and am running into some issues. I have been using CD74HC107E and have been unable to get it to function reliably.

Is there something i'm missing with the above schematic? I want the J and K to be high so that the clock input will switch Q with each falling edge. The data sheet for the flip flop is below. It claims to have buffered inputs to help debounce, would a low pass filter/schmitt trigger be nessecary for this application

Thanks


http://www.mouser.com/ds/2/405/schs139d-127059.pdf

 

[Harald Kapp]

Have a look at this thread. I think it's the same issue here.

 

[Blumpkinson]

That was the problem, thank you.

Ran into another problem, the FF is supposed to have a schmitt trigger input, however i'm still running into bounce problems. I've tried setting up an external RC filter like the one from the other thread, however the FF no longer switches. Would I be better off starting with a different type of FF?

 

[(*steve*)]

It might be worth posting the circuit you're using now.

 

[Harald Kapp]

That would be very helpful indeed.
Plus: a Schmitt trigger doe not relief you from the bounce problem. It helps only if the slew of your input signal is very slow. Your RC filter may slow down the signal edge too much so the level never reaches the threshold of the input if you press the button only momentarily. What happens if you press the button for a little longer?
Can you observe the signal using an oscilloscope?