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- State of Jefferson
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- 2017 CX-5 GT AWD+
Interesting conversation. I found this on the web fwiw:
There exist packaged LEDs with two die connected in parallel but with opposite polarity with respect to the two input leads so that light will be emitted regardless of the polarity of the applied voltage.
The example that first comes to mind are the bi-color LEDs(or tri-color), such as the ones with red and green die. By control of the direction of the applied current it can be made to shine red light or green light. When subject to AC it appears (Red + Green) = Yellow.
source: https://forum.allaboutcircuits.com/...rized-and-non-polarized-led-different.140016/ [post #4]
That's followed by a little schematic. If that's correct, and it sounds correct, the packaging makes all the difference, and could be designed to supply the same color light regardless of polarity. We all agree that diodes only pass current in one direction. But we're talking about "bulbs" which are more than just diodes.
And don't let the question of the polarity of the light produced confuse the issue!
Another interesting sidenote. 7 referred to his "electronic engineering" education. When I was in school, it was called "electrical engineering", long before ICs, etc. Remember "solid state"?
There exist packaged LEDs with two die connected in parallel but with opposite polarity with respect to the two input leads so that light will be emitted regardless of the polarity of the applied voltage.
The example that first comes to mind are the bi-color LEDs(or tri-color), such as the ones with red and green die. By control of the direction of the applied current it can be made to shine red light or green light. When subject to AC it appears (Red + Green) = Yellow.
source: https://forum.allaboutcircuits.com/...rized-and-non-polarized-led-different.140016/ [post #4]
That's followed by a little schematic. If that's correct, and it sounds correct, the packaging makes all the difference, and could be designed to supply the same color light regardless of polarity. We all agree that diodes only pass current in one direction. But we're talking about "bulbs" which are more than just diodes.
And don't let the question of the polarity of the light produced confuse the issue!
Another interesting sidenote. 7 referred to his "electronic engineering" education. When I was in school, it was called "electrical engineering", long before ICs, etc. Remember "solid state"?