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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
DIVIDE BY 12??
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loss1234



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PostPosted: Sun Sep 14, 2008 7:38 pm    Post subject: DIVIDE BY 12?? Reply with quote  Mark this post and the followings unread

just wondering, is there an equivalent chip to the 7492?
they call it a base 12 ripple counter



there is an old electronotes circuit that uses it for divide by 12 and i cant find any cmos chips that do that division. (the circuit in question uses it to divide by 3, 6, and 12 i believe.)

thanks

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wmonk



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PostPosted: Mon Sep 15, 2008 7:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi!
I'm following this forum for about half a year or so, but didn't post yet.
You can divide by 12 with de 4040 (which is 12 bit ripple counter)
Same for 14 (4020) and the 4060, which is a 14 bit ripple counter with internal oscillator.

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richardc64



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PostPosted: Mon Sep 15, 2008 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Um...a 12 stage ripple counter doesn't divided by 12, it divides by 2 twelve times: 4096.
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Blue Hell
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PostPosted: Mon Sep 15, 2008 11:26 am    Post subject: Reply with quote  Mark this post and the followings unread

richardc64 wrote:
It's quite OK to make music with tea spoons and rubber bands!


Uh oh Shocked

Re. the Q.

I had a quick browse for an equivalent in CMOS but nothing showed up ... you can use two dividers though, one set to divide by three and another to divide by four. The 4017 would be suitable, you'd need two. For the 4017 you simply connect one of the outputs to its reset input, the output selected determines the division.

Other options would be the 4018 but that needs a bit of extra logic to make it divide by three. Or the 40103 could be used as well, for that one you set up a count on the jam inputs but it looks like it might need some logic to make it work properly.

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robthefiddler



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PostPosted: Sat Sep 27, 2008 6:02 pm    Post subject: heres a way Reply with quote  Mark this post and the followings unread

check out the Blacet frequency divider.
[url]
http://www.emusic-diy.org/Schematics/WaveShapers?action=AttachFile&do=get&target=blacet.gif[/url]

The mixer after the flip/flops are dividing by 1 1.5 2 and 3. just add a counter to the 3 to divide by 2 a few more times.

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Mikmo



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PostPosted: Sun Sep 28, 2008 3:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Good old Forrest Mims comes to the rescue.


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JovianPyx



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PostPosted: Thu Oct 30, 2008 9:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Does anyone know if the above 4027 divide by 3 circuit produces a 50% duty cycle output?

Also, in the divide by 3 counter diagram, there is an error. Pin 2 is shown as Q, but it should be Q-bar since it is an inverted output.

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Uncle Krunkus
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PostPosted: Thu Oct 30, 2008 2:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

ScottG wrote:
Does anyone know if the above 4027 divide by 3 circuit produces a 50% duty cycle output?


I haven't really checked it out, but I would propose that it would be impossible to divide by 3 using flip-flops and get a 50% duty cycle.
It will divide by 3 by counting to 3, so you could get 33% or 66% only.

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JovianPyx



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PostPosted: Thu Oct 30, 2008 2:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Now that you say that, it is impossible because the clocks to both flipflops are the same so the circuit cannot react except on one edge. I designed a 50% duty cycle divide by 3, but I manipulate the clock to one flop with logic to make that happen. My circuit uses 2 JK flops and an NOR gate.
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urbanscallywag



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PostPosted: Fri Oct 31, 2008 2:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Would this apply here?

Odd Number Divide By Counters With 50% Duty Cycle and Synchronous Clocks

http://www.onsemi.com/pub_link/Collateral/AND8001-D.PDF
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Uncle Krunkus
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PostPosted: Fri Oct 31, 2008 4:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great find Scallywag! Very Happy
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urbanscallywag



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PostPosted: Fri Oct 31, 2008 4:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. I was looking into odd clock division for top octave dividers and remembered seeing divide by 3 with 50% duty cycle. The original application note I found might have been for programmable logic. Idea
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Mikmo



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PostPosted: Mon Nov 03, 2008 4:14 am    Post subject: Reply with quote  Mark this post and the followings unread

I just checked the Mims book that the schematics in my previuos post comes from, and it does not mention anything about the duty cycle.
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