"Mark Lloyd" wrote in message
...
On Fri, 16 Feb 2007 13:54:18 -0800, "Bob F"
wrote:


"Mark Lloyd" wrote in message
.. .
On Thu, 15 Feb 2007 13:18:23 -0800, "Bob F"
wrote:


"Mark Lloyd" wrote in message

LEDs in parallel with each other? It's unlikely that all would
light,
since the threshold voltages would be slightly different, and the
one
that's lowest would prevent the others from lighting.

As someone said earlier, your LEDs probably are actually LED
modules,
and come with built-in resistors. You have a separate resistor in
series with each LED.

He said 3V LEDs in one post - that implies the internal resister.


Not necessarily. As I said in another message, some LEDs have forward
voltages that high. That's the LEDs themselves.

Considering the circumstances, I doubt that that is the case here.

Bob


What I said definitely IS the case. What I said is just to disagree
that "3V" IIMPLIES "internal resistor". Nothing else.

These are "3V LEDs" provided for a school project. These would
seem very likely to be LEDs designed to operate easily off of
3 volts, since LEDs are rarely described as "X volt" in any other
circumstance. Certainly not at the "consumer" level.