Greetings. -led Question

Discussion in 'General Electronics Chat' started by Lonelynewyorker, Aug 29, 2014.

  1. Lonelynewyorker

    Thread Starter New Member

    Aug 29, 2014
    Hello. I'm getting into small electronics repair. I have not done extensive work, so I've come to this forum to look for advice on coming projects! Hopefully I can meet some cool people and figure out some problems!

    So, let me state what brought me to this site. I have a small electronic device. I wanted to change the color of the led indicator. (Very small 2mm red led. ) when I removed the red led, and tried to put in the new blue one, it would not light up. When I put the old one back in it lit up. This is a very small 2 pin led indicator used in the late 90s. How can I determine a working replacement? Thanks so much for help, and respect to anyone reading this.
  2. ISB123

    Well-Known Member

    May 21, 2014
    Different colored LEDs have different required current and voltage drop.
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    Different color LEDs have different forward voltage drops. Blues are typically more than 3.6V, while Reds are typically about 1.9V. Likely, there is not enough voltage ahead of the the current limiting resistor to even turn on the Blue one...
  4. Lonelynewyorker

    Thread Starter New Member

    Aug 29, 2014
  5. BeerBelly

    New Member

    Dec 16, 2013
    Leds are also polarized. Could it have gone in backward? No insult intended.
    tom_s likes this.