Led Indicator Lights

[SamIAmUBUF]

Actually, it wouldn't be terribly hard to do, provided you don't mind using an active circuit to make it work. I don't see any practical way to do it with passive components.

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I'm all about active circuits. How would I wire this thing?

[lovekraft]

Here's one approach:

This setup is based on a dual-ganged 2K linear potentiometer (VR1) and a bicolor LED with similar Vf on both diodes (red/green or red/yellow are usually fairly closely matched) - if using a bicolor with different Vf from one to the other, you'll have to adjust R1-R3 to get the correct response. Please be aware that running LEDs is not going to be easy on your battery, so expect to change often. The opamp in fig. B can be your favorite low current, low noise device. Some necessary components are not shown (such as coupling caps, where necessary), but are left as an exercise for the reader. In other words, this is a concept illustration, and NOT a ready-to-build project.

Edited November 20, 2005 by lovekraft