[BadWolf]

http://www.youtube.com/watch?v=j5nPgNdSbqc

Trying to make this setup work, but its refusing for some reason, I cant seem to find anything helpful on Google, so maybe you guys know something I dont

problem described in the comments section of the vid, yes I have tried using resistors, but no progress. I also tested 4 dif colors, green, yellow, blue and red, all but blue lit up.

my sis is trying to make Vinyl Scratch from My Little Pony (bro-hoof anypony? :D)

any ideas?

[jawfin]

I can't see what's under the breadboard. It is in series or parallel? (I assume it's DC). If you put the red one in the blue's position then try to place the blue one what happens? Are they the same wattage? Does the blue glow even a little? I can only suspect the red has a higher wattage and is starving the blue by it's demand. Are they even designed to run off the same voltage?

You could even test them in series by touching the legs and sticking the other leg of each into the power. I'd start really simple doing that too, like only using a 9 volt battery.

[BadWolf]

I can't see what's under the breadboard. It is in series or parallel? If you put the red one in the blue's position then try to place the blue one what happens? Are they the same wattage? Does the blue glow even a little? I can only suspect the red has a higher wattage and is starving the blue by it's demand. Are they even designed to run off the same voltage?

Not exactly sure what you mean by series or parallel, but the breadboard basically runs down a single line, left to right all of the holes on a single line will carry the charge down the row.

the positioning doesnt matter in this case, pos and neg are all lined up down the row accordingly

The packaging only mentions volts, not watts, so IDK there. The blue and red LEDs require at least 3.5 volts respectively, I have the curcuit attached to a 12 volt battery so more than enough power (used resistors to see if it made a dif, none). If the red takes more juice and thus starves the blue then green and yellow LEDs wouldn't light up fine along with red and not blue when hooked to the circuit.

I have played around with LEDs and this is the only time something like this has happened, it cant be the volts not matching because I tested a jumbo LED and 4 small LEDs on the same circuit with all 5 lighting up fine.

[Tricky]

Is this ALL blue LEDs of that kind, or just that one in particular?

[John]

Pretty much what Jaw said. In parallel circuits your voltage stays the same but the current will differ between the diodes and a nasty habit of traveling the route of least resistance.



In series circuits the current stays the same and voltage changes.



If it is helpful you can use some formulas to figure out where all your electricity is going.

[MetaDragoon]

and i am the 1 that is going to be an electrician lol

[BadWolf]

Is this ALL blue LEDs of that kind, or just that one in particular?

I have tried 2 different types of blue LED, they both seem to react the same.


As I said before I even tried 4 different colors in an attempt to see if there was power loss. I tried green, yellow, red and blue at once on the same circuit and all but the blue lit up.

[jawfin]

As John said, path of least resistance. So try that exact same process with the LED's reversed, and then with 2 blues, and then with 2 reds. And when that fails use 2 power sources, 1 for the blues and 1 for the reds. By looking I do think the red is more greedier, it appears bigger and puts out more light. Failing that just buy some more diodes that are from the same manufacturer which have the same specs only different colors. Even then, power can only go so far so it'll be the closest gets served first.

[BadWolf]

Alright, finally got the chance to speek with an electronics instructor at the college and she gave me a formula that made them work together now. sorry for my lack of real info in this topic, thanks anyway guys :S