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  • Voltage Booster?

    Does anyone know how to bump up voltage just a bit? Maybe by 1 volt?

    I soldered some wires to the power LED on my laptop that I plan to run to a button that has an integrated LED. There doesn't seem to be enough voltage to power the LED that's inside the button. There's enough to power your standard green/red/yellow LEDs (which aren't very bright) but not the super bright ones. Is there any way to bump the voltage or does anyone know of any bright LED's that run on low voltage? I could just tap the LED into a different power source but I really like to have the LED fade in and out when the laptop is asleep.

  • #2
    How much voltage do you have now? Why is it enough for the power LED but not enough for the LED's you added? What is causing the voltage drop?

    It's probably not a really good idea to simply increase the voltage without understanding why it isn't sufficient - especially with LED's which don't draw very much power.
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    • #3
      Are you positive it's just an LED in the button? Switches such as from auto stores have a 12V light or LED with resistor in them. Others may be 120V AC neons.

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      • #4
        I haven't measured it yet because I don't have the laptop on hand at the moment. The LED I'm trying to power requires 3.5v before it'll even turn on and the surface mount LED on the motherboard takes about 2v to turn on. I could use a standard red/yellow or green LED which will work but it just won't be very bright, even for night time.

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        • #5
          Remove the one on the motherboard. If that doesn't work, test the open circuit voltage, but I'm betting that will do it. You could also trace the positive back and find the limiting resistor and get a higher voltage there, but connecting to that may draw more current that the LED driver can handle. It's probably a very small PWM driver.

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          • #6
            Originally posted by Curiosity View Post
            Are you positive it's just an LED in the button? Switches such as from auto stores have a 12V light or LED with resistor in them. Others may be 120V AC neons.
            Yeah, I've actually taken apart the button to replace the LED because I didn't like the colour. I made sure that there there were no resistors. If I just attach an LED to the phone cable that I soldered onto the board, a lower voltage LED will work but not the bright ones I want to use. I guess I'll try to remove the surface mount LED and see if that'll make a difference.

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