Equivalent Transistor.

ghosttwo · 2007-02-16T03:25:46+00:00

I am currently working on a project to regulate the speed of a computer's case fan using a momentary switch (see 7cc6e2b62e9e6cbc/). 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 (

Feb 16, 2007 21 Replies

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vasile 19 years ago

In your dreams my friend. 2N2222 it's a switching transistor. You can't speak about HFE = 50 for a switching transistor. can you explain why ?

Vasile

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Robert Baer 19 years ago

Maybe he does not know about forced beta...

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