Led Red Yellow
Led Red Yellow
IC controller for LED circuit design?
I have a circuit design problem. I want to fade in & out a blue LED and then a yellow LED, and then a red in a repeating sequence. The blue LED is 3.6 volts, the yellow 2.25 Volts, and red 2.2 Volts. I will be using a breadboard and have variable power source of 0-30V DC. The LED’s are rated 20 ma. So far I think I can use the IC 555 but I can’t find enough information on how to calculate the circuit. If you know how or know a link please let me know. If there is another simpler chip I could use that would be better? There is now a multi-color LED with a built-in IC chip in the base of the bulb only 1mm thick that does the same thing.(www.brite-led.com) I also have a LED display case that has a tiny controller that does the same thing and its not the 555 chip. There are no visible resisters or capacitors it’s a small 3/16″ dot. Any answers where to buy that tiny controller or if that fails how to design the with the 555 IC chip?
LED’s are current operated devices. If you supply the proper current to them, the voltage is not important. Because the LED’s are current devices, they won’t dim well by varying the voltage. You will need to design a pulse width modulated controller to make them dim correctly. The site below will give you some information on PWM circuits.
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