I want to mod LED powered by molex, What do i need. The last time i tried. direct LEDs to molex , all LEDs boom. wasted a lunch . So i want to know do i need a resistor? what ohm ?

Thanks karthyhu


Before you start you have to get some leds. I used blue leds with rating 3.5 volts and 20mA. Brightness is somewhere around 2000-3000 mcd. Resistor that is connected in series with the led is 100 ohms. This was the closest match that I could find from my toolbox. Needle is used to take the molex connectors apart.

You should look for 5 volt leds. With them you don't need to use a resistor and it makes the installation easier and faster to do.



It is best to use 3 mm leds in this mod. I only had 5 mm leds so I had to mod them a bit. Led on the left is filed so it can be fitted inside the molex connector. With 3mm led this step may not be needed.



Pins are kept in place with two claws. Bend them so that the pin is free to slide away from the connector. Just look inside the connector from the front side and you will see where to bend the claws.



There are three "wall" separating the pins from each other. Remove one of these walls either between 5 volt pin and the ground or between the two ground pins. I will be powering the led from the 5 volt line so these both choices work for me but if you are planning on using 12 volt line just remove the wall between 12 volt pin and the ground. To do the job faster I used Dremel with routing head. You can use side cutters or knife etc. Even if you place the led between those ground pins, you have to remember to get the power for the led from the five or 12 volt pin.



Ready to be fitted back inside the molex connector. Just bend those claws back a bit and slide the pins back in. You may hear a little click when the claws goes past the base of the connector and lock in place. After that I added some hot glue between the pins that are holding the led in place just to make it more secure.



Source

With these, who needs ccfls anymore

This post has been edited by chyu89: Sep 5 2008, 08:02 PM

Yo bro dunno whether this link would help u or not Molex Lights

what color of the LED you using?

Good thread.
I also tried connect direct to Molex Red Black.
Kaboom LED spoiled.
HELP

karthyhu Thanx a lot.
Ur link does help me

This post has been edited by muhdhafiz: Sep 4 2008, 01:46 AM

whatever LEDs ,those 80cents +. That day i boomed super bright LEDs

just use 330 ohm resister

This 1 is good, thanks .I'll redirect that page to here for others.

myb u can ask allngap for better led bro..iinm he got brighter one in small size

My uncle very powa!! his name is google

good thread... mayb 12 try tis mod later....

anyone can tell me what color 5volt pin? 12volt pin? and ground pin? anyone?

12v = yellow
5v = red
ground = black

thx dude...

where can i get LED & resistor in KL? eager 12 try tis mod... hehe

Jalan Pasar or order from this guy for LEDs http://forum.lowyat.net/topic/380683

hensemboy seems silent (senyap je..)... , did he sell led again??

wah nice...too bad my molex black colour

He's the only one .

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Added on September 6, 2008, 3:21 amNot necessary to put at molex. u can do a row of LEDs urself. I got 4 blue LEDs hanging at random places.

U got the concept, all u need is a lil innovative

This post has been edited by chyu89: Sep 6 2008, 03:21 AM

Off topic,

how bout led at performance fans?? how to do it?? the wiring system..hehe

wah, shud try this, twin ccfl lamp are lame and mahal . jusst a normal stick one.. we nid more like this. thanks for the tipc.

owh ya does it effect the performance of ur system?

woots, then i bring in other stuff instead of ccfl

sure la, if can bulk some LEDs,Resistors,wires, solder guns.

after this wan to try..
jez scared kaboom

Haha, Never hesitate to try,learn everyday. I did boom some LEDs in my PC.

impressive, i admire your creativity - never would i have thought that these things could sport LED's!

nice.

haha, keep updating this topic, hamdsomeboy no more selling led's kah? so hard to find in kuching these days, who selling pls pm me!

niclasteoh does.

ok ok... will pm him...any guide on the net or guide made by LYN members?

how about running light in the case...

u can use the power from the molex connector

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Added on November 11, 2008, 5:24 pmu can use the power from the molex connector

This post has been edited by dchew: Nov 11 2008, 05:24 PM

abit risky to mod the molex, u no afraid ur pc boom ar? or kena electric shock?

Molex current few volts only. no rasa,boom also the item u plug in boom 1st.

NO, psu wont kaboom i think, last time mine short circuit, the psu just turn off only.. then terus can on again.

This post has been edited by dchew: Dec 22 2008, 10:28 PM

correction bro... if good psu, will prob switch off...if capalang one---careful. maybe kaboommmm

tat means we should find a cheap hdd as testimen 1st?
i dunwan to take risk on my 160 hdd

Test HDD or test LED?

for those who use 100ohm can consider 75ohm coz according to ohms law;
r=v/i
v=3.5
i=0.02
r=3.5/0.02
r=75

how to mod hdd led?any suggestion plz..my hdd led so dimm

This post has been edited by mazarul: Jan 6 2009, 01:38 PM

that's is good sharing

nais.
Kaboom lagi nais.

hehehe..
nice modding..
wiLL trY later..
hopefuLLy no KABOOOOOMMMM...
heheh...

Wow...TS you are something lor...

Ha Ha Ha...wonder how you have an crazy idea???

BTW...its awesome...

best tread can make my pc look like disco edi ehehehehe

Metkumods

Bro...cool...

very cool and helpful guide haha
i'm happy with mine after learning from those guides =P

nice mod.
already know how to mod no need to spend give ppl help mod haha~

still got some question on that...
1.how to differentiate which pin on the led is positive and negative?and which pin need to plug to ground and 5v/12v?(i rmb form3 KH got learn but i 4get d...XD
2.the resistor nid to plug at positive side or negative?
3.can add a switch for that?

^^i wan start learn led mod dy...

google is very helpful to learn about it ler.. type LED or light emitting diode then a whole bunch of info would appear..in wikipedia mostly..
also with resistors..

see carefully within the LED..
there's a flag shape..that's the negative..the other is positive.
or
both of the LED legs are different length..one is shorter than the other..the shorter one is negative aka cathode (english) aka katod (bm) while the longer one is positive aka anode (english) aka anod (bm).. usually people differentiate it by looking at the legs as it is much easier than remembering the flag.. katod (bm) in a way also means shorty lol..

resistors has no positive nor negative o_O
either way is fine...read about resistors at google/wikipedia if u're unsure lur...

switches can be fitted either at the negative or positive..up to u..it's usually at the positive after the source or before all the resistors or LED or whatever..

if u're not using resistors...better make sure the source is around 3volts, don put more than that..if not, say bye bye to ur LEDs...



well, do some calculations using those resistance, voltage, amperes, bla bla bla.. I equals V over R that equation..lol..
also take note whether u wanna put it in series or parallel..
the voltage is shared when put in series whereas all the voltage is equal when put in parallel.
haha..buy more incase some got burnt or whatever~~


GoodLuck =P

This post has been edited by Jinster: Apr 3 2009, 11:59 PM

Some additional Info, the color of the LED will also determine the working voltage of the LED. Different color uses different die. For lower wavelength LED such as UV, Blue and Green(Super bright) and also white LED, the forward voltage will be around 3.5-4v. As for longer wavelength, such as green to red, the working LED will be around 1.8-2.5v. As LED is current driven, so it should be powered by a current driver, but as a driver is more complex, so we cap the working voltage accordingly using a resistor. So just do the calculation and use the approriate resistor.

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Added on April 4, 2009, 4:53 pmAs for the resistor recommendation, if the source is 5v, the recommended resistor value for blue LEDs should be 75-100ohms, and for amber, red LEDs, it should be around 150-200ohms, correct me if i'm wrong. I'm assuming the forward current for the LED is 20mA.

This post has been edited by zzzz52: Apr 4 2009, 04:53 PM

oh dang, haha..i burnt 5 blue LEDs when i set the voltage to 4.5v TT_TT
didn't have any resistors then..

anyway. thanx for the ADD!

i giv up the DIY d,very hard to solde on the both pin. i think coz it's chrome surface.

i advise... find a good sholdering pen and solder...

last i very easy to solder... but until i finishe the solder , i cant continue... the newly bought solder is so bad it cant melt or stick.

is solder problem ar ......
the timah can lekat on the pin surface,i just don 1 molex oni.
the rest,i giv up d. i purposely mod my 5mm superbright led,

i got something suprise coming out... i sholder somthing for 3 hours non stop...

later/tomorrow open new topis on that

wow,waitiing ur surprise