Hello. I have a homebuilt alternator. It's not a fast one. Output is 12v 1a after rectifiers. Using a 12v led to test with, it lights up good, but blinks. It's dc input at the led. I know if it would spin faster the blink is faster until there isn't one, but I'm thinking a capacitor may work. I'm a bit ignorant on capacitors. What do I need?