I am currently working on a project to regulate the speed of a computer's case fan using a momentary switch (see
After working with one of the other users, I was able to come up with a workable circuit based on his reference design, located here:
The problem is that I cannot find the specified transistors. I was able to aquire the rest of the components with minimal difficulty, but the Trans. are nowhere to be found.
What I need is a short list (doesn't have to be complete, of course) of transistors that would be equivalent to a 2N4401 NPN switching transistor. It must take a 5-volt signal (