dividing crystal oscillator with 4060

[madiger]

I have a 38.4khz crystal oscillator circuit that i have running into a 4060 ripple counter. i thought that if i used an AND gate on the Q5 and Q6 outputs that i would get a 400Hz frequency (2^5 + 2^6 = 96; 38400/96=400), but i'm getting a 350Hz with a 25% duty cycle. I need to divide the frequency down to a clean 400hz, any ideas?

 

[keith1200rs]

I don't think that sounds right. You should get 300Hz out with what you have built - the same frequency as Q6 but with lower duty cycle (25%) due to gating it with Q5.

What I think you wanted to do is reset the counter using the AND gate. The problem with that is you still don't get 50% duty cycle and you can get glitches when it resets the counter, although if you use Q6 as your output it will be OK.

Keith.

 

[madiger]

you're right, that 350 hz was a typo, i was getting 300 hz out of the AND gate. I tried your method and it worked perfectly, thanks!