Yay, my first post/topic on the EEVblog forums
Im currently designing a circuit which will have a 74LS90 as a frequency divider which will in turn drive an audio circuit, never mind about that, got most of that working atm
What I've been scratching my head over for the last week is to design a latch that will give a high output for the duration of the pulse if a push-button is pressed at the same time, and keep the output high for the duration of the pulse. And then give a low output after the pulse has gone low and stay low until the push-botton has been released and pressed again.
Now, you might be asking me why I'm using a 74LS90 as a frequency divider, the answer to that is that I'm using multipile pulses and timing it via an AND-gate. And we are talking really low frequencies here.
Following is a really crude sequencial diagram, drawn in Paint.
Had nothing else handy on this computer, please have me excused.
I've been drawing and thinking, but have not yet come up with something satisfactory.
So if anyone have an idea, please speak up. I already have some AND-gates and inverters in the circuit to spare, but it would be possible to change these out for other gates. And as allways, I'm trying to keep the chipcount low