Rgb Led Light
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Polarity questions!!!?
There is a RGB LED light I found and I wanted to know how to check the polarity or could you guys tell me. I tried checking the polarity of all the wires, didn't work.
Pics:
http://i73.photobucket.com/albums/i202/maxgonuts/100_0256.jpg
http://i73.photobucket.com/albums/i202/maxgonuts/100_0258.jpg
http://i73.photobucket.com/albums/i202/maxgonuts/100_0262.jpg
http://i73.photobucket.com/albums/i202/maxgonuts/100_0267.jpg
I wanna know how to make them work when connected to a 9V battery, and tell me what to connect to what.
I u can't see, the wires are Red, green. blue and white
You 'checked the polarity of the wires' with what? I hope you didn't already blow it.
Next, for initial fooling around, I would start with a couple of AA batteries in series to make 3V, instead of 9V. Go to your local electronics hobbyist store and get some resistors between 100 and 1000 ohms. You need to put a resistor in series with the LED.
Finally, what you have is probably a red, green, and blue LED with either a common anode or a common cathode. And, I would guess, that the common electrode is the white one. I can't tell from your third picture, but if you look carefully on the back of the board you may find that one wire connects to all 3 LEDs.
Last thing you have to figure out is which electrode is common. Start with the largest resistor you bought. Connect the battery to one end of the resistor, and the other end of the resistor to one of the colors. Connect the other end of the battery to the common (probably white) wire. If it doesn't light up, reverse the battery and try again. If it does light up, try the other 2 colors.
To use this, you will need a separate resistor for each LED. To get the color balance right, the resistor may have to be a different size for each color. Smaller resistor will make it brighter. Use a voltmeter and V = iR (i = V/R) to figure out the current. 5 mA is pretty safe. Greater than 10 mA becomes increasingly likely to blow it out.
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