can use this adpter to run fan ?

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pic below,

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here is what it says,

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basically what your adapter reads is that it provides 12V and up to 120mA output. you need to read what's on your fan too.

My fan at home says DC 12V 0.13A. note that 0.13A = 130mA.

So if I use your adapter with my fan, the voltage is compatible but my fan will draw more current than your adapter can handle, thus may overheat the adapter (BAD!)

You can try to find a 500mA or 0.5A adapter. That can handle up to 3 of my fans (130x3=390mA) connected in parallel safely.

Hope this helps...