Felipe Olivares , Find below a couple links for replacement power supply, The 2nd link has some what looks to be good info. you should read before replacing power supply. 1st link is to a replacement power supply, just ensure it is correct for your model # before ordering or you could also do a google search for possibly better pricing. If not what you are inquiring about keep the question alive. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://www.ebay.com.au/itm/Apple-Time-Capsule-Internal-Power-Supply-614-0440-614-0412-614-0414-Replacement-/281375312035?pt=PCA_UPS&hash=item41834688a3&_uhb=1
https://discussions.apple.com/thread/6508189?tstart=0