I am working on an LED (RGBs to be exact) lighting project. I have an RGB controller that works well, but the RGB lights that came with it are crap, so I'm trying to adapt newer, better lights. The problem is that the RGB computer uses a 0-4VDC (+/- 0.5V) variable power source to the RGBs. My new RGB lights require 12VDC to burn at full intensity, so somehow I need to amplify the 0-4VDC signal to a 0-12VDC variable signal. I have tried building a noninverting amplifier using an op amp model 1458, with a 12VDC source and the 0-4VDC for the input. The problem is that I only gained about 0.5VDC and my attemps to build multiple amplifier circuits in series have failed - not to mention it would require a large moving box to house all the circuitry when completed. Any help would be appreciated. Thanks.