Author Topic: diff color leds , diff voltages ? (Read 9861 times)

armis · « **on:** December 25, 2008, 08:13:44 AM »

So if the leds are diff how does amp make them equal?
OR how much voltage does the amp give off?
idk how to put the question together

DarkShot · « **Reply #1 on:** December 25, 2008, 08:25:50 AM »

The amp gives off the same voltage. You need to add resistors to level out the voltage for the LEDs.

And next time search.

armis · « **Reply #2 on:** December 25, 2008, 09:25:13 AM »

u have any idea what voltage it gives off?
and what kind of resistors i would need?

bustinthejustin · « **Reply #3 on:** December 25, 2008, 11:13:38 AM »

Well since you're in the slim section, I assume you're talking about voltage coming off the amp on a slim. (turns out, the voltage off a slim and a phat are different)As for the voltage output, I was wondering the same thing but not many answers. I put in a blue led with no resistor, and the led blew right away once sound came out, but I have heard 10 ohm resistors will work for blue leds. I would test it, but my multimeter snapped...

armis · « **Reply #4 on:** December 25, 2008, 11:40:29 AM »

hmm can i use 1 resistor for many leds? or 1 for 1
http://mouser.com/Search/ProductDetail.aspx?qs=TKHZiN0HOz3smwpfQ6qVgA%3d%3d are these good?

bustinthejustin · « **Reply #5 on:** December 25, 2008, 11:46:53 AM »

Yeah those would work - I think 1/8w would work better because it's smaller, but if space is not an issue, 1/4w works too. You can use 1 resistor for many leds if you wire it in parallel, I think. Here's a diagram.

armis · « **Reply #6 on:** December 25, 2008, 12:00:09 PM »

so oh the PLUS side i mount the resistor. then i wire off leds from the resistor right?
for green white i dont need resistors...so i wire the leds BEFORE the resistor right?

DarkShot · « **Reply #7 on:** December 25, 2008, 12:09:12 PM »

Quote from: armis on December 25, 2008, 12:00:09 PM

so oh the PLUS side i mount the resistor. then i wire off leds from the resistor right?
for green white i dont need resistors...so i wire the leds BEFORE the resistor right?

All you need is a resistor in place, as long as it is before the connection of the leds, or after.

So that means the resistor can be on EITHER the positive OR negative terminal.

armis · « **Reply #8 on:** December 25, 2008, 12:15:02 PM »

so it doesnt matter if i put leds before resistor it will still be with resisted voltage?
but if i dont need resistor for white and green ones where i put them then?

DarkShot · « **Reply #9 on:** December 25, 2008, 12:18:19 PM »

If you don't need a resistor for them, than all you have to do is connect the leds to the terminals.

armis · « **Reply #10 on:** December 25, 2008, 12:28:39 PM »

what are "terminals"?
and i need resistors for 3 colors and i dont for another 2 colors

bustinthejustin · « **Reply #11 on:** December 25, 2008, 12:34:47 PM »

Okay. Do you want to hook up 5 different colors of different voltages, or one at a time? If you wish to connect all the different colors, then it'll be wired something like this:

Each resistor would be resisting the correct voltage for each led, and if there is no resistor needed, just take out the resistor. Darkshot means by terminals as in just wire the led directly to the power points and just don't use a resistor.

Alien_X · « **Reply #12 on:** December 25, 2008, 12:38:04 PM »

What the heck are you doing?

Why have you put the same value resistor on each led's branch???

armis · « **Reply #13 on:** December 25, 2008, 01:30:38 PM »

i got white,green (3.5 both) Red ,Blue,yellow (2.5) i would only need resistors for 2.5 v leds right? so how would i do that? cuz i only need resistors fpr 2.5 not 3.5

bustinthejustin · « **Reply #14 on:** December 25, 2008, 02:52:58 PM »

Quote from: Alien_X on December 25, 2008, 12:38:04 PM

What the heck are you doing?

Why have you put the same value resistor on each led's branch???

Because I'm just showing how to wire it, not what resistor values to use.

Quote from: armis on December 25, 2008, 01:30:38 PM

i got white,green (3.5 both) Red ,Blue,yellow (2.5) i would only need resistors for 2.5 v leds right? so how would i do that? cuz i only need resistors fpr 2.5 not 3.5

Uh depends on what your voltage output on the amp is. But first: Are you wiring different colored leds to one amp, or only one color?

armis · « **Reply #15 on:** December 25, 2008, 03:20:27 PM »

all on one amp. What is the voltage from the amp..anyone know that?

bustinthejustin · « **Reply #16 on:** December 25, 2008, 03:43:50 PM »

Idk probably around 3.4-3.8 volts. if we assume the voltage is about 3.6 volts, then you could wire it like this picture:

and the resistor values would be:

white/green: 10 ohm (This is a little more than what's needed, but I'm assuming your max voltage is 3.5 so we'll cut it safe at 3.4)
red/blue/yellow: 68 ohm (Once again, this is a little more than needed, but we're just playing safe)

Of course the output is an estimate so you should probably wait until someone gives us a definite output.

armis · « **Reply #17 on:** December 25, 2008, 04:43:05 PM »

ok ill try waiting but im gonna order more leds and resistors.

bustinthejustin · « **Reply #18 on:** December 25, 2008, 04:52:20 PM »

I think you can get packs of resistors at Radioshack of many different values. Maybe try that. Also my advice may not be the best/incorrect so yeah... But those resistor values should be close and the way I'm showing the wiring should work although it may not be the most efficient.

armis · « **Reply #19 on:** December 25, 2008, 04:53:18 PM »

so the leds wont be bright?

bustinthejustin · « **Reply #20 on:** December 25, 2008, 04:56:45 PM »

See, it really depends. The amp gives off variable voltages/currents (No clue which one lol I'm a noob) so you really have to use a resistor for the highest amount of voltage that comes out, unless you want your leds to blow every time you play a loud song. As I said earlier, you should wait until somebody gives you the correct voltage that comes out of an amp, then I can give you better values. I'd check (because I want to know too) but my multimeter is dead. I'll probably be getting a new one tomorrow.

armis · « **Reply #21 on:** December 25, 2008, 05:08:10 PM »

i ordered those resistors and some leds ...could wait

bustinthejustin · « **Reply #22 on:** December 26, 2008, 05:18:50 PM »

What the hell... Did some testing (tried to anyway) and I must say... WTF!? My multimeter is half broken, but it seemed to test batteries fine so I figured I'd be able to do a little testing on my psp. When speaker is not connected/has a bad connection, idle gives like 3.9v... Then, when I connect the speaker/give it a good connection, all of a sudden it jumps to something like 4.5v. THEN, when I start playing music with no speakers, I'm getting whacked values like 2.5v, 2.9v, etc. I thought the voltage goes UP when music goes. After that I did something stupid and killed my multimeter completely. So I didn't get around to testing music with speakers connected. God damn. Anybody think that putting too much voltage through an led and blowing it might've caused my sound amp to blow something as well?

armis · « **Reply #23 on:** December 26, 2008, 08:30:12 PM »

today i tried connecting leds to speakers. I only connect to one speaker right?

psp339 · « **Reply #24 on:** December 26, 2008, 08:45:07 PM »

Quote from: armis on December 26, 2008, 08:30:12 PM

today i tried connecting leds to speakers. I only connect to one speaker right?

I tried connecting two different colored LEDs to one speaker and it one color will not work. Does anyone know if it is true that you can only wire same colored LEDs to one speaker?

armis · « **Reply #25 on:** December 26, 2008, 08:48:02 PM »

wow if u cant do that ....and i want like 5 diff colors ocnnected... so lame

bustinthejustin · « **Reply #26 on:** December 26, 2008, 09:11:46 PM »

Psp, did you wire in parallel or series? If it's wired in parallel, I think you have to add resistors to equal resistance out or something and I don't even think you can wire it in series O_O. I don't know, but I know you can wire up diff color leds, but there's a certain way to do it. Still, the main question is: What's the voltage coming out O_O

psp339 · « **Reply #27 on:** December 26, 2008, 10:34:20 PM »

Quote from: bustinthejustin on December 26, 2008, 09:11:46 PM

Psp, did you wire in parallel or series? If it's wired in parallel, I think you have to add resistors to equal resistance out or something and I don't even think you can wire it in series O_O. I don't know, but I know you can wire up diff color leds, but there's a certain way to do it. Still, the main question is: What's the voltage coming out O_O

I wired 1 blue and 1 green led to one speaker. One color will not light up. I wired them in parallel.

bustinthejustin · « **Reply #28 on:** December 27, 2008, 12:14:16 AM »

which color didn't lite up? I think green doesn't use as much voltage.

psp339 · « **Reply #29 on:** December 27, 2008, 01:29:59 AM »

Quote from: bustinthejustin on December 27, 2008, 12:14:16 AM

which color didn't lite up? I think green doesn't use as much voltage.

I forgot which one doesn't light up. I remember trying 2 red+2 white and white does not light up.

armis · « **Reply #30 on:** December 27, 2008, 09:43:08 AM »

hmm.... mine greens are 3.4 and so are whites , blue 2.4 red 2.4 and yellow i think either 2 or 2.4
so i connected 1 led to speaker and tried another.....first one went dim another bright
first led was white and 2nd was red.....the red isnt very sensitive cuz if the musics loud even on psp it barely blinks while white does.
tried this on my pc speakers....

bustinthejustin · « **Reply #31 on:** December 27, 2008, 02:23:43 PM »

You have blue leds running on 2.4v? You sure? I think your red get's bright and your white doesn't because red has less resistance and currents like finding the easiest way to ground or something. And since red is so bright it will barely react while white is dim so it will react better I think. Were these in parallel or series? I think you should just add some resistors to the red led. You should probably ask someone with better understanding in electronics than me though...

armis · « **Reply #32 on:** December 27, 2008, 02:39:27 PM »

oh nvm the blue ones are 3.4 same as white and green.
they were in paralel.
i bought 10 and 68 ohm resistors...i hope they work.
but i still have no idea how to connect all of them together when resistors are needed for yellow and red and not for greenblue white

Alien_X · « **Reply #33 on:** December 28, 2008, 03:23:25 AM »

I've never seen so much misinformation in one thread!

armis · « **Reply #34 on:** December 28, 2008, 08:15:27 AM »

Quote from: Alien_X on December 28, 2008, 03:23:25 AM

I've never seen so much misinformation in one thread!

explain please sir?

bustinthejustin · « **Reply #35 on:** December 28, 2008, 10:05:45 AM »

Be quiet

I said various times I needed somebody with better electronics knowledge, but no, you had to sit and laugh at us while we feebly try to figure out how to do this... Perhaps you should explain?

armis · « **Reply #36 on:** December 28, 2008, 10:09:24 AM »

ye dont laugh but explain , if u know better then we do.

bustinthejustin · « **Reply #37 on:** December 29, 2008, 03:26:19 PM »

Alright I picked up a new multimeter after my old one died.... Here are my results:

No sound: 3.6v

With sound: average 3v

I don't know why voltage goes down when sound comes out but whatever. I think a 10 ohm resistor will do fine to prevent it from blowing. Should receive my LEDs in the next week or so, and when I do, I'll do some testing to see what resistor value reacts the best...

As for your question with different colored leds, I found a website that gives good info about it:

http://www.theledlight.com/ledcircuits.html

It's a section somewhere near the bottom.

armis · « **Reply #38 on:** December 29, 2008, 04:38:09 PM »

so... i would need a resistor for EACH led?
"Why do the LEDs have to be the same color?" If you mix colors, say if you paralleled a red (~2.3V) and two blue (~3.5V), the blue LEDs would not light. Why's this? Because the electricity is going to take the easiest path it can to complete the circuit and in this scenario the red LED requires less energy, leaving the two blue unpowered and lonely. To fix this you would need to stick a resistor onto the leg of each LED to 'equalize' all of the LEDs

psp339 · « **Reply #39 on:** December 29, 2008, 04:45:43 PM »

Quote from: armis on December 29, 2008, 04:38:09 PM

so... i would need a resistor for EACH led?
"Why do the LEDs have to be the same color?" If you mix colors, say if you paralleled a red (~2.3V) and two blue (~3.5V), the blue LEDs would not light. Why's this? Because the electricity is going to take the easiest path it can to complete the circuit and in this scenario the red LED requires less energy, leaving the two blue unpowered and lonely. To fix this you would need to stick a resistor onto the leg of each LED to 'equalize' all of the LEDs

So you will be forced to run the blue at ~2.3v to make all the LEDs light up?

armis · « **Reply #40 on:** December 29, 2008, 05:54:52 PM »

i i have no idea lol....

bustinthejustin · « **Reply #41 on:** December 29, 2008, 06:03:20 PM »

Okay. So you have say a 5 volt power supply, okay? Now, blue leds run at 3v while red run at about 2.3v. So since the red uses less voltage to light up, all the voltage goes through the red and the blues don't get lit up. To fix this? You need the correct resistor on each led to equalize resistance. To do this, you just use the OHM Law if you're familiar with it, and if not, just use an LED calc. Put in your supply voltage (in our case, 5v) and the LED forward voltage (3v for blue, 2.3v for red), and the operating current (usually about 20mA). Then it will give you the correct resistance needed for each LED.

Here's a wiring diagram assuming your supply voltage is 6v and your blue leds run at 3.5v and your red at 2.3v.

I think you only read half the article. All this information was on the page, if you read through all of it.

armis · « **Reply #42 on:** December 29, 2008, 06:47:13 PM »

so i would need a resistor for each led right?

bustinthejustin · « **Reply #43 on:** December 29, 2008, 06:49:55 PM »

Yeah.

armis · « **Reply #44 on:** December 29, 2008, 07:15:50 PM »

so i cant like put 1 b4 10 leds ....=[

bustinthejustin · « **Reply #45 on:** December 29, 2008, 07:38:53 PM »

Not unless they're the same color.

armis · « **Reply #46 on:** December 29, 2008, 07:42:33 PM »

so i cant put 5 white without resitors and then 5 red with them?

bustinthejustin · « **Reply #47 on:** December 29, 2008, 07:47:38 PM »

Uh, no. Unless your white leds run at your supply voltage which I highly doubt. I think you might be able to do a half parallel/half series wiring but I'm not sure.

armis · « **Reply #48 on:** December 29, 2008, 08:02:04 PM »

i think the way i wanna do it will not work out =[

bustinthejustin · « **Reply #49 on:** December 29, 2008, 08:29:17 PM »

What do you mean?

Alien_X · « **Reply #50 on:** December 30, 2008, 01:15:55 AM »

Mother of heck

Tell me what you want done, I will draw you the circuit.

armis · « **Reply #51 on:** December 30, 2008, 07:15:05 AM »

ok ok. what i wanna do is.... d pad abxy and by speakers all white leds, triggers blue, in the jewel 4 yellow 4 green 4 red going down in this order. white, blue,green are 3.4 v and yellow and red i think 2 and 2.4 not sure about yellow. So i wanna wire them so they are sound sensitive

bustinthejustin · « **Reply #52 on:** December 30, 2008, 09:06:02 AM »

Damn. Have fun Alien

armis · « **Reply #53 on:** December 30, 2008, 09:07:05 AM »

yup; i just thought of that too alien

Jumbo · « **Reply #54 on:** December 30, 2008, 04:56:04 PM »

Wouldnt that look nasty with all those random colors on at the same time?

armis · « **Reply #55 on:** December 30, 2008, 05:39:26 PM »

no
what i wanna do is all front buttons and by speakers white....triggers blue and in the back in jewel my country flag's colors.... so they are yellow green red...thats why i wanna do that

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Author Topic: diff color leds , diff voltages ? (Read 9861 times)