Boost PWM Signal to 12 V LED strip?
I haven't tested this, and its off the top of my head, but based on http://www.stuffandymakes.com/blog/2012/07/08/disney-glow-with-the-show-ears-teardown the LEDs are common anode with the microcontroller sinking current (open drain). Using a optocoupler on each line, with the led amp providing the power switching, you should get exactly what you want. All you need is the optocoupler in between vcc and the rgb led (one per color).







simulate this circuit &ndash; Schematic created using CircuitLab