![[H]ard|Forum](/styles/hardforum/xenforo/logo_dark.png){kind=logo}
Navigation
Install the app
How to install the app on iOS
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
More options
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Standard Mobo LED Voltage
- Thread starter PoW
- Start date
MD_Willington
2[H]4U
- Joined
- Jul 15, 2004
- Messages
- 2,233
I'd say it's time to get out the DMM and set it to DC volts and measure.
Later
MD
Later
MD
Are you driving an LED? Then, I don't think it matters. I've never seen a motherboard that needed the LED to have its own current-limiting resistor, so I'd expect the motherobard would source about 15mA, maximum.
Are you driving something other than an LED? Then I think you're doing the wrong thing; you should drive the LED in an optoisolator, then let the transistor on the optoisolator switch whatever load you want to drive.
.B ekiM
Are you driving something other than an LED? Then I think you're doing the wrong thing; you should drive the LED in an optoisolator, then let the transistor on the optoisolator switch whatever load you want to drive.
.B ekiM
Its not the current im worried about its the voltage, i know there are millions of varieties of LED's in the world and I want to make sure I pick up something that is gonna not be fed to much or to little voltage. Due to the lack of responses i assume this isnt much of an issue.
PoW said:Its not the current im worried about its the voltage,
You're worried about the wrong thing, if you're only using the output to drive an LED.
If you're using the output to drive something else, you're still worried about the wrong thing because you should be worried about driving a device the output wasn't designed to drive.
.B ekiM
Talonz said:No, the worst that can happen is your new led lighting dimly
Assuming he's driving an LED. If he is, then the worst thing that can happen is the LED is shown too much current and it burns out.
.B ekiM