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-   -   Need some LED circuit help! (https://forum.overclock3d.net/showthread.php?t=81972)

wassupdoc 21-09-17 11:27 PM

Need some LED circuit help!
 
Hey guys, this is a project I've done many times before.
But this time, for some reason things are just not playing ball.

I'm trying to make a custom LED loom for a build, two series loops of two LEDs in parallel to light up a CPU and GPU block. I'm using a +12V (yellow) and GND (black) connection from a 4-pin Molex connector.

https://i.imgur.com/pBW5TJ5.png

I'm using these LEDs: https://tinyurl.com/ycor7jd9
2 in each parallel branch,

In series with a resistor: https://tinyurl.com/ybe9eyty

And this wire (Yes it's got that frustrating I've even checked the wire's datasheet!): https://tinyurl.com/create.php

I'm studying a masters in electronics, and I've done and redone all the theoretical maximum calculations; Everything should work perfectly!

Yet, whenever I switch the PC on, the resistors are becoming burning hot, along with the LEDs! I've continuity checked for shorts, checked voltages, everything seems perfect!

Can anybody with experience with this sort of thing shed some light?

(Mods if this is in the wrong forum please let me know :) )

Eddie long 22-09-17 06:17 AM

its been a long time since i did this but i don't think you resister is big enough you need a 270 ohm at a 0.25watt , but my maths maybe a bit out thats for a pair , i i seem to recall better to have resister on ground line

wassupdoc 22-09-17 11:28 AM

Quote:

Originally Posted by Eddie long (Post 959345)
its been a long time since i did this but i don't think you resister is big enough you need a 270 ohm at a 0.25watt , but my maths maybe a bit out thats for a pair , i i seem to recall better to have resister on ground line

Do you know what the best thing is, you're totally right! I'm actually colour-blind, now I check they are 27ohm resistors instead of 270! Fml 😂

Eddie long 22-09-17 04:56 PM

none of us are perfect , and i'm far from it , glad to be of help :)

Wraith 23-09-17 02:46 AM

I knew I had a thread that needed updating, thanks guys. FYI the wizard linked in the thread still works. https://forum.overclock3d.net/showthread.php?t=64250 LED wiring configurator

Eddie long 23-09-17 05:43 AM

Quote:

Originally Posted by Wraith (Post 959410)
I knew I had a thread that needed updating, thanks guys. FYI the wizard linked in the thread still works. https://forum.overclock3d.net/showthread.php?t=64250 LED wiring configurator

very handy link Wraith :)

wassupdoc 23-09-17 12:40 PM

Quote:

Originally Posted by Wraith (Post 959410)
I knew I had a thread that needed updating, thanks guys. FYI the wizard linked in the thread still works. https://forum.overclock3d.net/showthread.php?t=64250 LED wiring configurator

Great thread wraith :) You might have seen it before, but I always use this software (freeware) when I can't be bothered to get out my notepad and paper to work out any kind of circuit calculations! http://www.electronics2000.co.uk/download.php It does so much more than LED resistor calculations, definitely worth adding to your thread :D

It's definitely useful to be able to hold up a resistor to the screen and compare it to the colours there when you're colourblind! :')

Re-wired it up with new LEDs and 270r resistors this time! Surprise surprise, it works :D The moral of this story, don't do electronics at 10pm after a full day of work :yelrotflmao:

Unfortunately Maplin (had to get some last minute LEDs as it's a surprise for a friend's build) have no control over their stock, I ordered 4 more orange LEDs to redo it, 3 are in fact orange, but one is yellow. FML >.<

Eddie long 23-09-17 06:53 PM

i didn't even think of checking the web or forum when i posted reply , i did it old school ,, oh god i'm showing my age lol

wassupdoc 30-09-17 01:29 AM

Quote:

Originally Posted by Eddie long (Post 959447)
i didn't even think of checking the web or forum when i posted reply , i did it old school ,, oh god i'm showing my age lol

I tend to work it out in my head, got to use the masters for something :p It's reading the bloody resistors that's my problem :lol:


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