Calculate the total current required by yr fans and add an additional 20% as buffer. If yr fan does not state the current but gives u the power instead, just take the Power Divided by the Voltage and you will get the current. Just add all the current together to get the total current required.
A 1 Amp Adapter should be ard $15 in Sim Lim Tower. Basement 1, try the shop beside the Escalator. Or try top floor... just walk ard n look see... surely can find 1 with the best price.
Hope this helps
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