Multicolor led with 2 pins

[[email protected]]

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!

 

[John Tserkezis]

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?

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.

 

[default]

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!

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.

LED1081
T1-3/4 Flashing RGB LED LED1081
Your Price
$1.40

Detailed Description
This RGB flashing LED is a winner. Apply 4.5Vdc, 90mA and let the fun
begin. The LED flashes red, then green, then blue. If you
leave it connected, the LED goes through a multitude of flashing,
fading, dual colors, etc.
Display your own personal "light show". The flashing rate, at start
up, is 1.4 times per second(1.4Hz). Let your mind run wild and figure
out new places to mount your new prize. All of this and it is in a
T1-3/4(5mm) case. LED1081......

http://docs.bgmicro.com/pdf/page12.pdf
http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=10895

 

[Jamie]

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!

Reverse the polarity.

 

[Gary Tait]

[email protected] wrote in @w3g2000hsg.googlegroups.com:

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!

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.