In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bennettdan wrote:

This is the smallest transformer I could find it has .3 amp output.
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=102517&pa=102517PS
then you can use a bridge rectifer to convert the AC to DC 
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=178183
Then use something like a LM2937 to regulate the 5vdc
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=297810
And if you read the datasheet that comes with the LM2937 on page 6 at the bottom shows you a schematic to make a regulated voltage.
 http://www.jameco.com/Jameco/Products/ProdDS/297810NSC.pdf
I hope this helps..

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