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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Idea for "chaining" two 4017's for longer sequences
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Joined: Feb 02, 2010
Posts: 266
Location: California

PostPosted: Thu May 13, 2010 5:02 pm    Post subject: Idea for "chaining" two 4017's for longer sequences
Subject description: (kinda)
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If you have a clock signal fed into an inverting stage, couldn't you run the straight signal into one 4017, and the inverted into another? So they would sort of switch off? I think they would actually overlap gates for 1/2 of the durration of each of their steps

So it would be like

Code:

Clock --->             _|¯|_|¯|---> 4017 #1
Clock ---> Inverter =  ¯|_|¯|_|---> 4017 #2




So while the clock goes low, it goes high through the inverter and moves the second 4017 ahead another step... they would "take turns" moving ahead a step.

Does that work?

I see in the 4093 datasheet that you can set up an input on it to invert a clock so that it triggers high when it gets a negative edge.

There is probably a different way to do it better, but that was just one idea I thought of. I thought of another one, but I forgot it now. I will post it when I think of it again. Very Happy
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Joined: Feb 02, 2010
Posts: 266
Location: California

PostPosted: Thu May 13, 2010 5:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh, I just thought about it further, and there is a much better/simpler way, though it uses three 4017's -- one that is alternating back and forth between the two others (which are clocked on outs 0 & 1 respectively), which are basically acting as even and odd number counters.

Hmmm... would that give you 19 steps, or 20? Would the 20th step have to act as a reset?
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electri-fire



Joined: Jul 26, 2006
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PostPosted: Sat May 15, 2010 5:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

On cascading multiple 4017's :

http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/28080-cascade-3-4017-counters.html
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-minus-



Joined: Oct 26, 2008
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PostPosted: Mon May 24, 2010 8:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

in a bit of a hurry today... have you seen this?

http://www.bowdenshobbycircuits.info/page5.htm#4017-7.gif

I'm going to be experimenting with this cascading 2x 4017 steps soon... I'l keep watching this space!
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Joined: Feb 02, 2010
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PostPosted: Wed May 26, 2010 12:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

-minus- wrote:
in a bit of a hurry today... have you seen this?

http://www.bowdenshobbycircuits.info/page5.htm#4017-7.gif

I'm going to be experimenting with this cascading 2x 4017 steps soon... I'l keep watching this space!


I had seen that in some internet browsing. It is a simple way of doing it... I don't really understand how the diode AND gate thing works.

Also, I am not sure how easy it would be to adapt that to have an adjustable reset point.
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