more on 555 and 4017 - Electronic Circuits Projects Diagrams Free

daviddoria · 26th February 2003, 09:48 PM

i now have a working 555 yay!

ok so now i am connecting 8 and 13 of th 4017 to ground, 14 to 3 from the 555, 16 to Vs, and led to pin 3 - then to ground, and pin 2 to 15 to reset it after 1 output.

is there anything wrong with that? i'm going to try to draw it for you in my new software

http://www.bandtank.com/~calculusap/oscillator.ewb

that looks pretty crappy... how do you make the lines not go through stuff?

Gene · 26th February 2003, 11:22 PM

Congrats! Sorry I couldn't get your Elect. Workbench file but your description sounds fine. Move that pin #15 connection up a bit, add some LEDs, and turn that 4017 loose to run. I appreciate your posting as so many people ask a question and never reply. You never know if they ever came back and read the replies - strange.

daviddoria · 26th February 2003, 11:36 PM

haha.

so i can't seem to get the LEDs on the counter to turn on..... i am going to go try a transistor now... but i thought the output of the counter was enough to turn on an led... if that doesn't work i'll post again to see what else i can do.

thanks
david

Gene · 26th February 2003, 11:47 PM

Since I can't see your circuit, I don't know what your power source is but a 555/4017 powered by a 9 volt battery should produce about 5 volts at pin 3 of the 4017 (plenty to burn out an LED without a dropping resistor).

Maybe you could PM me with your .ewb file as an attachment - don't care if it's crappy.

I am assuming from your first post that you have confirmed a pulse comming from the 555 - check your connections.

daviddoria · 26th February 2003, 11:50 PM

hahahaha i got it!!!

gene, again i'm almost sure i saw that the 4017 has internal ouput resistors... i'll try to find it again.

my problem was simply with how i was connecting the leds to the breadboard. they were shorting themselves! i'll be darned!

well it works now, time to put it on a protoboard

)

i'll take a video and send you when i'm done (might be a couple days)

thanks a million!
david

Gene · 27th February 2003, 03:08 AM

The 4017 has a current limitinng circuit which is marginal-at-best for operation at 5 volts. You can also limit the output by connecting the input pulse through a resistor. The easiest way is to connect your LEDs directly to the output pins of the 4017, tie the (-) side of the LEDs together, and run that through one resistor to ground (this is ususlly possible since only one LED is lit at a time).

There is no need to do the video for me - just glad you are up-and-running. BTW, before you solder the thig up, now would be a great time to experiment with the different functions of the 555 and 4017 (pulse timing, timing vs. astable operation, reset after different counts, and cascading multiple 4017s). Enjoy!

daviddoria · 27th February 2003, 03:12 AM

again thanks soooo much. indeed that is an excellent idea. i was actually planning on throwing another 4017 in there to get them to go backwards as well just to see how to do it

and also mess with timing values.

david

(just in case

)
http://www.bandtank.com/~calculusap/lights.wmv

bogdanfirst · 27th February 2003, 07:15 AM

great work.....working fine!

daviddoria · 28th February 2003, 03:06 AM

only one more question!
i got this working several times now, that means i understand, yay!

i am using Trax Maker to draw. I noticed that on my 4017, there is no pin 8 and no pin 16. these are Vs and ground. when i hit "simulate" it doesn't work (i'm guessing because the chip isn't getting power)

i also noticed on a drawing by kinaljp that he was missing the same pins...
is there a way to add pins? are they left off for a reason?

david

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26th February 2003, 09:48 PM	(permalink)
daviddoria	more on 555 and 4017 i now have a working 555 yay! ok so now i am connecting 8 and 13 of th 4017 to ground, 14 to 3 from the 555, 16 to Vs, and led to pin 3 - then to ground, and pin 2 to 15 to reset it after 1 output. is there anything wrong with that? i'm going to try to draw it for you in my new software http://www.bandtank.com/~calculusap/oscillator.ewb that looks pretty crappy... how do you make the lines not go through stuff? __________________ thanks, david

26th February 2003, 11:22 PM	(permalink)
Gene	Congrats! Sorry I couldn't get your Elect. Workbench file but your description sounds fine. Move that pin #15 connection up a bit, add some LEDs, and turn that 4017 loose to run. I appreciate your posting as so many people ask a question and never reply. You never know if they ever came back and read the replies - strange.

26th February 2003, 11:36 PM	(permalink)
daviddoria	haha. so i can't seem to get the LEDs on the counter to turn on..... i am going to go try a transistor now... but i thought the output of the counter was enough to turn on an led... if that doesn't work i'll post again to see what else i can do. thanks david __________________ thanks, david

26th February 2003, 11:47 PM	(permalink)
Gene	Since I can't see your circuit, I don't know what your power source is but a 555/4017 powered by a 9 volt battery should produce about 5 volts at pin 3 of the 4017 (plenty to burn out an LED without a dropping resistor). Maybe you could PM me with your .ewb file as an attachment - don't care if it's crappy. I am assuming from your first post that you have confirmed a pulse comming from the 555 - check your connections.

26th February 2003, 11:50 PM	(permalink)
daviddoria	hahahaha i got it!!! gene, again i'm almost sure i saw that the 4017 has internal ouput resistors... i'll try to find it again. my problem was simply with how i was connecting the leds to the breadboard. they were shorting themselves! i'll be darned! well it works now, time to put it on a protoboard ) i'll take a video and send you when i'm done (might be a couple days) thanks a million! david __________________ thanks, david

27th February 2003, 03:08 AM	(permalink)
Gene	The 4017 has a current limitinng circuit which is marginal-at-best for operation at 5 volts. You can also limit the output by connecting the input pulse through a resistor. The easiest way is to connect your LEDs directly to the output pins of the 4017, tie the (-) side of the LEDs together, and run that through one resistor to ground (this is ususlly possible since only one LED is lit at a time). There is no need to do the video for me - just glad you are up-and-running. BTW, before you solder the thig up, now would be a great time to experiment with the different functions of the 555 and 4017 (pulse timing, timing vs. astable operation, reset after different counts, and cascading multiple 4017s). Enjoy!

27th February 2003, 03:12 AM	(permalink)
daviddoria	again thanks soooo much. indeed that is an excellent idea. i was actually planning on throwing another 4017 in there to get them to go backwards as well just to see how to do it and also mess with timing values. david (just in case ) http://www.bandtank.com/~calculusap/lights.wmv __________________ thanks, david

27th February 2003, 07:15 AM	(permalink)
bogdanfirst	great work.....working fine!

28th February 2003, 03:06 AM	(permalink)
daviddoria	only one more question! i got this working several times now, that means i understand, yay! i am using Trax Maker to draw. I noticed that on my 4017, there is no pin 8 and no pin 16. these are Vs and ground. when i hit "simulate" it doesn't work (i'm guessing because the chip isn't getting power) i also noticed on a drawing by kinaljp that he was missing the same pins... is there a way to add pins? are they left off for a reason? david __________________ thanks, david