Hi,
I break a multicolor night light and find that it has only one radial led but it is multicolor (red, blue,) and of 2 pins. How to do that? Do anyone see similar design or LED before? The night light turns its color gradually from red to green and to blue and then recycle. Is it used different voltages to control the colors?
Thanks!
Back-to-back leds, with reverse polarity to each other. In your case, one polarity is red, the other blue. If you use AC (with PWM), you can create various other colours.
Quite commonly available. Even from our plain enthusiast stores here in Australia, they're available in both flavours (two and three pin).
This works because leds in reverse polarity behave "sorta like" 5v zener diods. Since forward bias is 2-3v, you'll never come across problems.
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To get red blue green you need a RGB diode.
There is a two lead novelty diode with tricolor leds built into a standard 5mm led package.
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Reverse the polarity.
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It uses constant voltage/current to the package for power. There is a chip in the package that does the color cycling and LED driving. There is no way to conrtol what LEDS in the module to light.
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