10 LED sequencer using 4017 counter

[Ghost]

Hi Rob, a newbie here 

Me trying out the "10 Channel LED Sequencer" from the webby u link..

Just to ask u , wat is needed to change if i would like to change the Voltage input from
6V to 12V. Cause me intend to put it in the car.. 

and also about the LED used, can i use those ultra white?

Btw, today just saw some resistor... there are those 1/4 watt and 1/2 watt..
wat are the different??  Cause i see them seems to be small so it is better to use them..

[Rob]

Welcome to the the boards, Ghost.

Thre's two ICS in that circuit, the 555 and the 4017. They both can take a supply voltage of up to 15V, so no problems there. I don't see anything else you'd actually have to change.

Ultra white are no problem--you have thiose transistors at the outputs, they can each handle up to 200 mA load, so you can pretty well drive any LED you want except the expensive 1-Watt ones (like Luxeon).

1/2 Watt will be bigger--they can dissipate more power. The power dissipated in a resistor is V*I (or I²*R, or V²/R, whatever's easist to calculate/measure). I like to pick a resistor so that the acutal power dissipated is less than 60% of the rating.

So for your counter circuit, there will be about 1.5V across that 240 ohm resistor at the bottom. P = (1.5²/240 = 0.009W, no problem to use a 1/4W.

Good luck!

(I made this into its own topic.)

[Ghost]

Thx Rob for the fast reply..
hope i can do it...
 

[Triad.:]

Can someone help me find the link that is being referred to in the first post?

[mrwurm]

It might be this one . . .

http://www.metku.net/index.html?sect=view&n=1&path=mods/vilkkuvalot1/index_eng

[Rob]

I was probably referring to this one:
http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm#4017-2.gif

I like Bill's site, he's a good guy and the diagrams and explanations are high-quality. Japala's another good friend of mine and his site is also excellent. I just have a harder tme remembering "vikkuvalot" instead of "LED sequencer." (Although I can't forget rottaflekti).

[Triad.:]

awesome. Thanks to the both of you! Excellent sites.

[Rob]

I guess it's worth mentioning the difference between those circuits--Bill's version has cheap (about 6 cents) transistors driving the LEDs, Japala's has them directly driven by the 4017 output. The Bill circuit candeliver more current to the LED (or give you the option to drive several LEDs in series from each output by using a higher collector voltage on the transistors). that extra 60 cents in parts buys a great deal of flexibility.

[Esoteric]

hi, this link features lots of LED driver circuits including 10 LED sequencer using 4017:

http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm#4017-2.gif
http://www.spelektroniikka.fi/kuvat/valojono.pdf

[AutoXSystems]

Hey ghost,

  Did you even consider using a Programmable PIC. It could give you much more flexability. The number of outputs from a PIC can be anywere from 2 to 40 depending on what type of pic you want to use. I do programming on the side. I have made many projects and have lots of experience in LED controlling. did you want dimness controll. It all possible with a programmable pic. how did you want to talk to the chip? Serial? I2C, USB? If you can think it I cane build it.

see my website. www.autoxsystems.com it is still under counstruction but Many new pictures and movies will be updated soon.

  If you need help I'm your Guy!

post a reply or email me at sales@autoxsystems.com and we can chit chat!

Dale Schroeder