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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Symmetrical Digital Dividers
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PHOBoS



Joined: Jan 14, 2010
Posts: 1648
Location: Moon Base
Audio files: 332

PostPosted: Mon Sep 09, 2013 9:23 am    Post subject: Symmetrical Digital Dividers
Subject description: Odd divisions with a symmetrical output
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Something I came across yesterday. 3 circuits to divide a squarewave by 3, 5 or 7 but with a 50/50 output. I dont'know if it's been posted before
but seems useful for lunetta's Wink anyway you can find it here. I allready had a CD4013 wired up on breadboard for a /4 divider, so all that was needed
was to add the XOR. The oscillator I used is a CD4046 VCO which allready has a build in XOR, so that was easy to hook up and it works like a charm. Very Happy

If you add a switch in the "feedback loop" and a pulldown resistor to the XOR's input you can choose between /3 or /4. (with some more switches
/1.5 and /2)


There's also a Four Phase Clock Generator on the same site which could be a nice addition to a lunetta Cool

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commathe



Joined: Jul 26, 2013
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Location: Beijing
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PostPosted: Mon Sep 09, 2013 9:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fantastic! This is precisely the kind of thing I've been looking for.
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Cynosure
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Joined: Dec 11, 2010
Posts: 659
Location: Toronto, Ontario - Canada
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PostPosted: Sun Oct 13, 2013 5:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for posting this link in chat. I guess I missed it when you first posted it. Very cool Smile
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elektrouwe



Joined: May 27, 2012
Posts: 41
Location: Germany

PostPosted: Tue Oct 15, 2013 12:34 am    Post subject: Reply with quote  Mark this post and the followings unread

yes, this is a very old trick. But a nice one and a good idea to repost it every decade for the newbies Smile . It can also be used with a 4017 or any divider to get symmetrical outputs : use a frequency doubling circuit - in this case an XOR, but simpler gates with RC spike generation on the rising and falling clock edge will work too - feed the doubled clock to any divider and symmetrize the output by /2 e.g. with a T - flip flop.
don't overlook: input clock must be symmetrical.
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