= TIMER = - Electronic Circuits Projects Diagrams Free

I R Haynes · 3rd November 2003, 06:50 PM

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 · 3rd November 2003, 09:03 PM

Is this what you're looking for?

Kane2oo2 · 3rd November 2003, 09:29 PM

could you explain what that circuit actually does please?

Thanks
Kane

**kinjalgp** · 4th November 2003, 06:09 AM

You can find working of the circuit on this page:

http://www.electro-tech-online.com/viewtopic.php?t=360

I R Haynes · 4th November 2003, 05:55 PM

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

**kinjalgp** · 4th November 2003, 11:29 PM

What is the problem?

darowland711 · 7th November 2003, 01:45 PM

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 · 7th November 2003, 08:14 PM

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

Roff · 7th November 2003, 11:20 PM

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.

jcaluma · 8th November 2003, 01:16 AM

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

thanks!...

furrycow · 8th November 2003, 01:14 PM

I used Crocodile Clips!

jcaluma · 9th November 2003, 12:57 AM

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 · 9th November 2003, 04:40 PM

Check your private messages

I R Haynes · 21st November 2003, 12:17 PM

Deleted by moderator

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3rd November 2003, 06:50 PM	#1
I R Haynes	= TIMER = 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. __________________ Produced by I R Haynes

3rd November 2003, 09:03 PM	#2
Roff	Is this what you're looking for?

3rd November 2003, 09:29 PM	#3
Kane2oo2	could you explain what that circuit actually does please? Thanks Kane

4th November 2003, 06:09 AM	#4
kinjalgp	You can find working of the circuit on this page: http://www.electro-tech-online.com/viewtopic.php?t=360 __________________ "There is no way to peace, peace is the way!"

4th November 2003, 05:55 PM	#5
I R Haynes	bloody heck how am I spposed to read that, don't you guys have crocodile clips or anything __________________ Produced by I R Haynes

4th November 2003, 11:29 PM	#6
kinjalgp	What is the problem? __________________ "There is no way to peace, peace is the way!"

7th November 2003, 01:45 PM	#7
darowland711	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

7th November 2003, 08:14 PM	#8
furrycow	i think i have a solution i designed this circuit, i hope it is what you mean 8) Attached Thumbnails

7th November 2003, 11:20 PM	#9
Roff	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. Attached Thumbnails

8th November 2003, 01:16 AM	#10
jcaluma	software furrycow, i just want to ask what software did you use to draw the schematic?... thanks!...

8th November 2003, 01:14 PM	#11
furrycow	I used Crocodile Clips!

9th November 2003, 12:57 AM	#12
jcaluma	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:

9th November 2003, 04:40 PM	#13
furrycow	Croc Clips Check your private messages

21st November 2003, 12:17 PM	#14
I R Haynes	Deleted by moderator __________________ Produced by I R Haynes