[TimMiller]

SCR's or SSR's go between the demultiplexer and the AC line. SCR's and SSR's are known as digital relays. The easiest way without some electronics background, would be to make a fixture that had multiple lights in it, then you would hook each colored light up to a different dimmer. Dmx decoders do not distribute AC. A decoder simply decodes the dmx into a 0-12v or 0-15v DC based on dmx value. There are also demultiplexers that decodes the dmx, into different protocols such as AMX, CMX, LMX, etc. In order to get AC to be proportonal to dmx, you basically have to use a special type of demulitplexer to fire a pulse to a digital relay to dim on and off a lamp.

Basic explanation of how a dimmer works, hopefully this helps. All dimmers now days (there is some pretty old mechanical dimmers that use a whole different method to dimming that are still in use) use SCR's or SSR's which is basically a digital relay. When the control circuit in a dimmer gets a dmx signal based on address and dmx value, it fires a pulse to the digital relay (the pulse is usually around 5VDC but it depends upon dimmers). The relay then sends a pulse of AC 120V to the light. The faster the pulses, the brighter the lamp appears, even though it is turning on and off extremely quickly.