Greetings. -led Question

Thread Starter

Lonelynewyorker

Joined Aug 29, 2014
18
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.
 

MikeML

Joined Oct 2, 2009
5,444
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...
 
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