I am looking at getting some multicolor LEDs, which have Red Green and Blue inside of them. I'm doing this for space saving, rather than using 3 different LEDs--I am using just one.
What I want to do is to use a multicolor bulb to produce all sorts of colors, mixing the channels (if you call it that) so I can the full color rainbow. I need to be able to use a single rheostat to do that, rather than using 3 independently so I can twist just one to change the colors up and down. If I need to use a small transistor, that's ok (I'd prefer to keep it simpler if possible) but I need the ability to use a variable controller knob to tune the colors.
I can't seem to find any circuit design that can do this 1) for a multicolor LED, and especially 2) for a variable control knob in it. Sure, I can do this with an Arduino but I'm trying to use this in way more simply.
I'm not set on using PWM or not using it, I just want the ability to set it up and be able to 'tune' it with a knob. If I can get away without using a transistor or having to program it, that would be ideal.