>Maybe that explains the popularity of blue LEDs.

I was told by my Keithley rep that the 2400 sourcemeter originally had a red 
LED for "output on", but they had to change it, and ended up with a blue 
one.

>Still, it's pretty cool that you can get green neons
>(& other colours) these days.  Is that what you used?

No, I couldn't bet a suitable neon, so ended up using an LED. I wasn't going 
to go to a lot of trouble, as we were making only 2 units. I just wanted an 
indicator that showed the mains was on if the switchmode supply went belly 
up, or a lack of it if a fuse blew. Result was some distributed resistors to 
drop mains to LED voltage. 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist