From what I have heard, most hobby servos are designed for 6V which is just a little low for the Arduino's regulator.
According to the data sheet for the following switching regulator, no additional external components like decoupling capacitors are needed. Can anybody confirm or refute this? http://www.digikey.com/product-detail/en/OKI-78SR-5%2F1.5-W36-C/811-2196-5-ND/2259781
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