Here's what I am trying to do. I am already controling 4 LEDs with a 9 volt zener regulator. I now want to control the source of the regulator (ie voltage from the battery on board my motorcycle) with an electronic switch. Not a big deal, but I also want the voltage to the LEDs to ramp up slowly so that when they initially turn on, they are dim, but get brighter and brighter until they reach their 9 volt regulated source. Then when I turn the motorcycle off, they fade slowly until all the way off. So I guess is what I want is a delay switch. Should I be switching the 9 volts regulated to the LEDs or should I switch the source to the regulator? What is the cheapest and easiest way to do this? Any help would be appreciated. Thanks.