Simple amp for a complete newbie

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Hi folks!
I recently bought two very cheap speakers that i would like to hook up with my computer. Commercial amplifiers are a bit too expensive, so i wonder if it is possible to construct one myself. The only things i really need are a volume control, two RCA or one trs jack, and some kind of connector for the speakers.
(Correct me if im wrong)
It would be nice if someone could give me instructions for this. :)

These are the specifications from the back side of the speakers:

Impedance: 4 ohm
Max continous power handling capacity: 20 W
Max music handling: 30 W
Sensitivity: 1,2 W
 
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