I recently purchased a bunch of 16x2 LCDs and did not notice until I
received them that the PCB has pads for a 3.3V to 5V regulator.   Does
anyone happen to know what regulator chip is commonly used on these
boards?  This could prove convenient in the future.

Here is the particular device in question:

http://www.ebay.com/itm/251049844026

And some close-up pictures:

http://imgur.com/a/zWKhE#3

-p.
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