Philippines is not any different that most other countries. Your wall voltage is 220V. Most pre-built power supplies (including the Antek) handle both 110V (north america) and 220V (the rest of the world).

http://en.wikipedia.org/wiki/List_of...nd_frequencies

The antek power supplies are actually imported to the US from China. If you ask around locally in electronics shops, or use google, you wont have a problem locating a power supply. Inexpensive ones will probably be the same as antek.

Where were you planning on buying the individual parts for the power supply? I bet they will have premade ones.

However if you are planning on scrounging your parts, you'll need to learn a little bit about transformers, rectifiers and filtering. Here is a little article that will give you a good idea of how it all goes together. Ignore the part about regulation.

http://www.eleinmec.com/article.asp?16

Of course your parts will be similar in concept, but different in value.