-
Welcome to Overclockers Forums! Join us to reply in threads, receive reduced ads, and to customize your site experience!
5v LEDs
- Thread starter HashX
- Start date
- Joined
- Jan 6, 2003
- Location
- I can see walmart, 44906
why not get a lower voltage one and use a resistor?
- Joined
- Oct 4, 2002
- Location
- Corinth, MS
Different color leds will operate at different voltages. You'll need a resistor to step down the voltage to the led but it's a simple calculation. (voltage source - led voltage) / led current = resistor value
So a blue led that runs at 3.5 V and 30 milliamps using the 5 volt line of a power supply would need a:
(5 - 3.5) / .03 = 50 ohm resistor
So a blue led that runs at 3.5 V and 30 milliamps using the 5 volt line of a power supply would need a:
(5 - 3.5) / .03 = 50 ohm resistor
Last edited:
- Joined
- Dec 13, 2002
- Location
- Southern California
my 3.5v(max4.x volt, according to the package) are really bright at 5v
i dont know how long they will live, but i did the molex mod for my 1 hdd and two roms and those three leds + an antec blue psu are all but lighting up the inside of my case. i may just get a couple more leds instead of a cold cathode
i dont know how long they will live, but i did the molex mod for my 1 hdd and two roms and those three leds + an antec blue psu are all but lighting up the inside of my case. i may just get a couple more leds instead of a cold cathode
- Joined
- Jun 22, 2002
- Location
- Asheville, NC
Serraph, is that 50 ohm or 50 kohm?
- Joined
- Apr 14, 2003
- Location
- ramadi, iraq
go here it's very helpful http://linear1.org/ckts/led.php
- Joined
- Oct 4, 2002
- Location
- Corinth, MS
It would be 50 ohms. The current draw of leds is really low so you don't need much resistance at all. The unit for resistors is volts/amps (ohms) which is why you need to convert the 30 miliamps to .03 amps
Also, here's a good rundown of simple circuits that all modders should read IMO. http://hw.metku.net/index.html?sect=view&n=1&path=mods/sahkooppi/index_eng
Also, here's a good rundown of simple circuits that all modders should read IMO. http://hw.metku.net/index.html?sect=view&n=1&path=mods/sahkooppi/index_eng
Last edited:
- Joined
- Jun 22, 2002
- Location
- Asheville, NC
ok just making sure cuz that pretty low
- Joined
- Aug 8, 2001
- Location
- Aurora, Illinois
Serraph said:
how come when I did the math it comes up to 116.66666666666667?
- Joined
- Mar 1, 2003
- Location
- the terran system
speaking of leds, when i tried to mod my mouse with one, In certain spots, it would lite up green, and in others it would be oragnge and get really really really hot, or maybe that was just me electricuting myself.
![Rocko[DPC]](/forums/data/avatars/m/30/30292.jpg?1626886300){kind=avatar}
- Joined
- Apr 22, 2003
Wiseass said:
Because he meant to say (5-3.5)/.03
- Joined
- Jan 6, 2003
- Location
- I can see walmart, 44906
lol green LEDs do generally turn orange and get hot at too much V.
- Joined
- Apr 5, 2001
- Location
- St. Catharines, Ontario Canada
- Joined
- Jan 10, 2003
Re: Re: 5v LEDs
They have a decent selection in the store too. Yes an actual store, with doors and everything.
Oni said:
They have a decent selection in the store too. Yes an actual store, with doors and everything.
- Joined
- Jun 22, 2002
- Location
- Asheville, NC
i checked the radioshck site... only 1 colored LED i saw maxed out at or above 5v... unless i missed em wich wouldnt surprise me... and none of them are very bright- i would check www.case-mod.com for cool LED's and then find what kinda resistor you need
Last edited:
- Joined
- Oct 4, 2002
- Location
- Corinth, MS
Rocko[DPC] said:
Yep that's what I meant. Fixed. Don't you hate when you are thinking something and write that down instead of what you're supposed to.
- Joined
- Apr 19, 2003
- Location
- Irving, Texas
- Thread Starter
- #18
wow guys thanks, i couldn't pop on for awhile - i know how to use the resistors its just a convienience issue - most everything we do is off of 5v lines - either from power supply or from usb
it looks like eled only had one green led that was 5v and didn't have an integrated resistor
it appears that all of (just one) radio shacks 5v'ers (only cause its fun to say) come with a holder for like 2.50 -- i didnt see any in the store ...
i always hear (read) people talking (writing) about these all the time - where are you getting them>?
(ebay is a no go for now too - but that could change)
it looks like eled only had one green led that was 5v and didn't have an integrated resistor
it appears that all of (just one) radio shacks 5v'ers (only cause its fun to say) come with a holder for like 2.50 -- i didnt see any in the store ...
i always hear (read) people talking (writing) about these all the time - where are you getting them>?
(ebay is a no go for now too - but that could change)
