Re: bi-color LEDs with mixed common lead

"Homer J Simpson" (nobody@xxxxxxxxxxx) writes:
"Michael Black" <et472@xxxxxxxxxxxxxxxxxxx> wrote in message
news:eemft4$3g2$1@xxxxxxxxxxxxxxxxx

But the three lead LEDs have them arranged so (with the common lead
being either the left or the right side, I forget which):
----|<---
----|<---

If you parallel the two other ends, all you get is two different
color LEDs that light up at the same time. There is no way of
changing color.

But if you connect to one, the other or both you get red, green or yellow,
right?

Now I'm confused.

What I read in the post I replied to was the suggestion that old
style two lead bipolar LEDs could be created by taking three lead
bicolor LEDs and connecting the two uncommon leads together.
The point of my post was that it wouldn't create a two lead
bipolar because the three lead package starts with a common cathode
or anode.

What confuses me in reading it now is what the purpose of that was.
The original poster wants an easy way to switch an led between
two colors. A two lead bipolar requires both sides to be driven,
one by a buffer (or directly if the original output is strong
enough) and the other side through an inverter. The three
lead LEDs would just need that same inverter, just arranged
differently.

Michael

.

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