freq devide by 2

[l_gaminde]

will i be able to change the duty cycle or will it just give a quick pulse, not sure what I really need at this time. I have plenty of 84s 628s and others. I would have to order the 390 part. I did consider this option already had the digital Ic gallery book out. Im thinking pic to start. once i get it working (see if it will work) then move on but price is about the same.

[l_gaminde]

Rmteo

I got a couple of the 390's have it sort of working, it seems to be pulsing. Am I correct that I must hit the clear pin every cycle as I could not get it working without this the circuit diagrams do not show this. What I did is take the output of q0 to the clock of ck1 and the output of I think q3 or q4 to the clear pin does this sound correct I tried to clear every pulsout of q0 but got nothing.

thanks larry

[rmteo]

Not sure what you mean by the clear pin. There is an MR (Master Reset) pin that when held high forces all outputs low. To divide by 2, connect the Q0 output to the CP1 input. Apply your signal to CP0 and Q0 will give you a /2 output (ensure that MR is held low).

[l_gaminde]

rmeto

Thanks for your help, I tried grounding the MR pin and got nothing when I first started, after reading your last post I wired it low and it worked great this is much better setup.

now as far as 32 bits being better not sure I agree
my brain is only 2 bits so it seems a Waste!!