I know this has been asked before but I'm trying to control the speed of a dc motor with my arduino. I looked around in the forum and found that I should use a transistor but I'm not exactly sure how transistors work or how I should wire it.

Controlling the speed of a dc motor?

system January 9, 2013, 10:45pm 7

I have 2n3904 transistors (if that matters) and everything else. Do I need to use a resistor before the transistor? How will it effect it?

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