LEDs

[NickLee1983]

Is there a color changing LED that changes its color based on the resistor attached to it? If so where can you get them?

[Flashman]

Usually they are two or three terminal devices based on voltage bias. However you could set up a bridge circuit that alters bias across them according to resistance.

[NickLee1983]

what its for is i am building a lawton PWM and on the potentiometers i am wanting to put leds that change their color as i change the resistance... how would i go about that?

[Flashman]

With a 3 wire like this, http://www.ledtechusa.com/data/datasheets/LT246X-XX-D51.html

I'd use a 1K or 500 Ohm pot coaxial with the pot you were using in the PWM circuit. Wire the wiper to +ve and put the anodes of the LED across it, and wire the cathode to 0V through a current limiting resistor.