# whats the difference?

Discussion in 'The Projects Forum' started by Tony357, Apr 25, 2015.

1. ### Tony357 Thread Starter Member

Mar 24, 2015
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I am trying to make a motor using coils and was given a 4017 IC to add to my 555 timer circuit and I'm am having problems. I've seen a circuit similar to mine and it uses a 4022 IC.

Can anybody tell me whats the difference and can i still use the 4017 the same way?
for some reason I can not load pdf's to compare.

Thank you.

Jun 6, 2011
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3. ### Papabravo Expert

Feb 24, 2006
10,136
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It seems improbable that you could freely substitute one of them for the other, especially not after the circuit has been constructed. Do you know the difference between a Johnson Counter and an ordinary counter? Another name for a Johnson Counter is a twisted ring counter. They can be implemented with a shift register and an inverter and they have the property that only one bit changes for each change of state. This is important if the states are being decoded to avoid false decodes.
For a 4-bit counter the state sequence is
0000 > 0001 > 0011 > 0111 > 1111 > 1110 > 1100 > 1000 > 0000 and repeat forever. The number of unique state is 2 times the number of bits. So a 5 bit Johnson Counter would have? That's right 10 unique states.

4. ### Tony357 Thread Starter Member

Mar 24, 2015
36
0
Hi therei have not constructed the circuit as of yet but i was just wondering if the 4017 can do what the 4022 can do?

Mar 24, 2015
36
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or a 4026 IC

6. ### Papabravo Expert

Feb 24, 2006
10,136
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Clearly not, if you need ten states an eight state counter won't do the job. Did you actually read what I wrote? Did you understand it?

7. ### Tony357 Thread Starter Member

Mar 24, 2015
36
0
I did read it but didnt understand I thought that you meant that was another way it can be used and was giving a example

8. ### Papabravo Expert

Feb 24, 2006
10,136
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I was trying to describe the two different parts mentioned in your original post. That was the gist of your original question -- right?

9. ### Tony357 Thread Starter Member

Mar 24, 2015
36
0
Yes and no, I'll try and explain; I am using the pulse from the 555 timer circuit and then trying to divide it by 7

10. ### djsfantasi AAC Fanatic!

Apr 11, 2010
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Having an idea of your objective, it's my belief that either the 4017 or 4022 could be used in a circuit for your requirement. The circuit would use different pins on each IC however. Do you know why? Can you show a circuit using the 4017 as a start?

11. ### Tony357 Thread Starter Member

Mar 24, 2015
36
0
Its a simple led chaser circuit and i have realised pin 3 nest to pin 8 is actually 13. To answer your question are the pins on the 4017 and 4022 in different places

12. ### djsfantasi AAC Fanatic!

Apr 11, 2010
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Simple LED chaser circuit or a Divide by 7 circuit?

Edit: Oh, I see. Seven LEDs.

13. ### Tony357 Thread Starter Member

Mar 24, 2015
36
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A divide by 7 i was tryin to do as i thought this would have the same effect i used the LED chaser

14. ### djsfantasi AAC Fanatic!

Apr 11, 2010
2,794
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I'm on a phone, so can only make a quick look. But generally, it looks like your 4017 circuit. I believe by now, you could also do it with a 4022. So, is your original question answered?

15. ### Tony357 Thread Starter Member

Mar 24, 2015
36
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Yes thank you thanks a lot

16. ### Tony357 Thread Starter Member

Mar 24, 2015
36
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Also i wanted to ask if i changed the LEDs in the circuit for a copper coil how would i connect each coil?

17. ### Papabravo Expert

Feb 24, 2006
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We've seen this circuit and this question before. If you replace the LED with a copper coil you will be trying to send 9V/100 Ω = 90 millamperes through the coil. The 4017 wont allow that much current to flow and will drop it's voltage or let the magic smoke out. But hey if you want to try it by all means be my guest.

18. ### Tony357 Thread Starter Member

Mar 24, 2015
36
0

i've made this with a few mods but ran into problems and could really do with as much advice as poss. can u help ? and i will try explain as much as i can

19. ### Papabravo Expert

Feb 24, 2006
10,136
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I can't do much to help you push large currents through copper coils with 4000 series CMOS devices. It just is not possible and whoever convinced you that it was possible is a fibbin'

20. ### djsfantasi AAC Fanatic!

Apr 11, 2010
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I thought the circuit and question was familiar.

The coil is a load and the LED is a load. How would you connect them? What's different between the two loads?

There are a couple major differences. The current required to operate each device is different. So you'll need an appropriate driver. Secondly, you'll need to protect your IC. From inductive spikes.