Control speed of a DC motor

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dear users,

what best way control speed of dc motor? i've tried control both pc fan , dc motor game controlled arduino board.
what did hook 12v power source tip122 , use analogwrite on pin 6 (using arduino nano) control input.
this used work rgb led strip control color, reason when put lower value 255 motor either doesn't run @ or makes buzzing noise.

i don't know electronics , think i'm totally doing wrong, don't know what.
hopefully of can send me right directions :)

which motor?  current take?  12v power source?  how current
can provide?  how have wired tip122?  have flyback diode?


Arduino Forum > Using Arduino > General Electronics > Control speed of a DC motor


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