Can I Use These Leds? Options

[deanage1983]

i have a load of these leds lying around but am not sure if i could use them in my xbox can anyone help??

they are 5mm and have a black chip on the side with 331 on with 2 smaller black chips on
ta





MOD EDIT: Pic fixed.

This post has been edited by RDC: May 11 2007, 11:41 PM

[deanage1983]

i want to string 6 together and illuminate the inside of my 360
i have 2 windows in casing

thanks

[RDC]

Those look like a cartridge type LED with a built in 330ohm Resistor, well not really since the pic is just a blur, but that's what I'm guessing from the description. If that's the case they're really setup to be driven from a 9v source (which isn't in the 360 anywhere) and will either need to be taken apart so you use just the LED and a proper Resistor for the voltages in the 360 or use a 9v Regulator on one of the 12v sources to get a 9v supply to use for them. You could also just drive them each off te 12v source and use a 100ohm Resistor on each so the the 330ohm and 100ohm combined would keep them from frying. This is all based on them being said type of LEDs though, either get a better pic or just get some new LEDs and Resistors and do it right from the start.

[deanage1983]

would it be better for me to strip the led from the board and attach a 1k resistor???

thanks
are 1k resistors


brown black red gold?

[RDC]

Yes it would be better to remove the LEDs and then wire them up correctly with the proper Resistor.

Yes 1k = Brown, Black, Red, Gold

The First band (Brown) is a number, 1

The Second band (Black) is a number, 0

The third band (Red) is either the Multiplier (best to think of it as the number of zeros) or a Divider if it's Silver or Gold, in this case it's 2 since it's Red, so two zeroes, 00. (NOTE: If Black is in the Third bands place it's 0 for no zeroes. Red, Red, Black, Gold would be a 22ohm)

1 0 00 = 1000ohms = 1k

The Fourth band (Gold) is just the Tolerance band, in this case 5% +/- of the 1k value, so the Resistor can be anywhere from 950ohms to 1050ohms (1.05k) in value.

Black - 0
Red - 1
Brown - 2
Orange - 3
Yellow - 4
Green - 5
Blue - 6
Violet - 7
Gray - 8
White - 9

Silver - 10% Tolerance
Gold - 5% Tolerance

If Gold or Silver is in the Third bands place, then it becomes a Divider...

Silver - Divide by 100
Gold - Divide by 10

...so...

Red, Red, Silver, Gold is a 0.22ohm 5% and Red, Red, Gold, Gold would be a 2.2ohm 5%.

P.S. Sorry bout the "lesson", just felt like sharing. There are other types of Resistors as well with more bands, but the majority of ones ya run into will be the 4 band type like these.

[RDC]

My bad man, I totally missed the "OK to use a 1k?" for some reason:

If you use a 12v source a 470ohm should be used, if you power them from a 5v source a 100ohm will work.

If ya already have a bunch of 1k, two of them in Parallel will get ya some 500ohm Resistors also.

This post has been edited by RDC: May 11 2007, 11:32 PM

[deanage1983]

would this work??

[RDC]

Yes, but ya wanna use 470ohm Resistors, not the 1k.

What voltage are these LEDs exactly? and what color? Take one off the board and run 3v into it and see if it lights up good. 2 x AA batteries or a power supply if ya have one that ya can select 3v from will work.

This post has been edited by RDC: May 11 2007, 11:39 PM

[deanage1983]

2 pic following 1st pic is running 7 leds in parralel with one 1k resistor from a 6volt source


this pic is same leds running one 100ohm resistor from 6 v source


and with no resistors


runs fine at 6v so presuming there 12v

(board still intact)

[deanage1983]

6v directly to led lit very bright then went dim and smelt a bit lol any help considered thanks

[RDC]

If you're powering them from a small "wall wart" transformer you're running a bit more than 6v in there, those things aren't regulated to the voltage they have listed on them, can't tell from the pics though.

Those LEDs have that built in Resistor also, so they may be setup to run from a 12v source, but since they're Blue they're most likely 3v to 4.5v LEDs. It's really hard to tell from a pic if the LED looks fine or overdriven too. Run one of them from a 12v source and see what happens, worst case it just burns itself out in a few seconds and then you'll know 6v to 9v is probably what they're supposed to be run at (with that built in Resistor), and ya can get 7v from the 360 by using 12v for your + to the LEDs and 5v for your ground to the LEDs.

This post has been edited by RDC: May 12 2007, 12:39 AM

[deanage1983]

at 12v dc with board run flawlessly but without they sizzled

so should i need any resistors?

just remembered where i got these they are from a slot machine

i await your advice

cheers

[RDC]

If it ran fine with the board and at 12v they'll be OK and you can drive them from a 12v source in the 360. If they were gonna pop at 12v with the board they would have, I'd say yer good to go if ya wanna use them the way they are.

This post has been edited by RDC: May 12 2007, 01:12 AM

[deanage1983]

thanks for your time will keep you posted with my results