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  1. #1
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    LEDs on 3.3v line

    Can you hook an LED rated for 3.1v - 3.8v, directly to the 3.3v line, or do you still need a resistor in there? I have been thinking of getting some LEDs to mod a case, and was wondering if this will work, or should I just run them off of the 12v line with resistors?

    Also, what rating of resistor would I need for running them off of the 12v line? Does it vary according to the rating of the LED?
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  2. #2
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    Mar 2004
    it does vary, more or less by color.

    whites tend to pull 3-3.5volts, ambers ussually 2volts, yellows and greens around 2.5. blues are the same as white.

    you shouldnt have any problem with the 3.3volt line. chances are the LED doesnt run EXACTLY 3.3volts, and it would only really be feasable for blue or white, but if its those colors, then the distance from the proper voltage shouldnt be enough to cause a problem, maybe shorten its life, but still get a few solid years out of it.

    in a 12volt line youd need resistors, and you gotta know the voltage of the LEDs you plan to run in the series.

  3. #3
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    Well I am looking at Blue LEDs, and they are rated at 3.1v - 3.8v, 3.5 typical. So do you think they would work just fine without a resistor?
    Main Rig: Asus P8Z68 Pro Gen3 * Core i7 2600K @ 4.4Ghz * 8GB (2x 4GB) Mushkin Blackline PC3-1600 * GeForce GTX 560TI 448 1280MB * 6TB Storage * LG BD/RW * Lian-Li PC-V2000B * Dell 24" 2407FPW & Asus 24" VS248H
    Backup Rig: Gigabyte EP45-UD3P * C2Q Q9400 @ 3.2Ghz * 4GB (2x 2GB) G-Skill PC2-8000 * Sapphire Radeon 4870 512MB * 320GB Storage * Samsung SH-S203N DVD+/-RW * Apex Full Tower Case * 2x Dell 19" LCD
    HTPC: Abit IP35PRO * C2D E6600 @ Stock * 2GB G-Skill PC6400 * Geforce 8600GT 256MB * 640GB Storage * Lite On 16x DVD-ROM * 55" Samsung 1080p 3D LED LCD via HDMI

    Media Server: DFI Lanparty UT NF4 Ultra-D * A64 3800+ X2 * 1GB PC3200 * Powercolor X800XL * 14TB Storage * Lite On 16x DVD-RW

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  4. #4
    Member AlucardCasull's Avatar
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    you can get led's at different voltages, check out ebay, i got a crap load of 5v's for my mouse, even though i learned that the power is actualy 3.3v at the led, oops!

  5. #5
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    Mar 2004
    they should work fine. 1 to a series of course. but yeah, assume the typical. might not be... but typicly safe to assume.

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