= TIMER =

I

I R Haynes

New Member

• Nov 3, 2003

• #1

I am having trouble designing a circuit using a 555 timer and a 4017 chip and making lights go on sequentially. I would like to have a variable resistor also, so then the time between the light changes can vary.

Please help.

 

Roff

Well-Known Member

• Nov 3, 2003

• #2

Is this what you're looking for?

 

K

Kane2oo2

New Member

• Nov 3, 2003

• #3

could you explain what that circuit actually does please?

Thanks
Kane

 

kinjalgp

Active Member

• Nov 3, 2003

• #4

You can find working of the circuit on this page:

https://www.electro-tech-online.com/threads/convert.360/

 

I

I R Haynes

New Member

• Nov 4, 2003

• #5

bloody heck how am I spposed to read that, don't you guys have crocodile clips or anything

 

kinjalgp

Active Member

• Nov 4, 2003

• #6

What is the problem?

 

D

darowland711

New Member

• Nov 7, 2003

• #7

help

if you would email me at DARowland711@hotmail.com, i may be able to help you with a detailed process... We made this circuit a few weeks into school in my electronics class.... It takes alot of testing, readjusting and when its all done, its a fun thing to show people


DARowland711

 

furrycow

New Member

• Nov 7, 2003

• #8

i think i have a solution

i designed this circuit, i hope it is what you mean 8)

 

Attachments

• ReplyAstable_4017.jpg

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Roff

Well-Known Member

• Nov 7, 2003

• #9

I made a few changes. The "???" means that I don't know why these are here. They do nothing.
The CD4017 wll not drive LEDs very well. I added 2N3904 emitter followers. You can try it without them, but you may not get much light from the LEDs. With the transistors added, you could change the 330 ohm resistor to 180 ohms for added intensity.
I changed your variable resistor to 100k, and added a 1k resistor in series. You should get a better frequency range with these changes. You might want to change the timing capacitor from 100uF to 10uF.

 

Attachments

• ReplyAstable_4017.gif

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jcaluma

New Member

• Nov 7, 2003

• #10

software

furrycow,
i just want to ask what software did you use to draw the schematic?...

thanks!...

 

furrycow

New Member

• Nov 8, 2003

• #11

I used Crocodile Clips!

 

jcaluma

New Member

• Nov 8, 2003

• #12

thanks!

but too bad i still have to purchase a copy....
there's a demo for download but i'm not sure if there will be more restrictions and the time limit.....
maybe you have a copy of the installer of this software, maybe you could lend it to me.....hehehehehehe :lol:

 

furrycow

New Member

• Nov 9, 2003

• #13

Croc Clips

Check your private messages

 

I

I R Haynes

New Member

• Nov 21, 2003

• #14

Deleted by moderator