This adapter is 12 to 48 volts.. Is 48 the standard for all notebooks? It's $94 - would a cheaper 110v converter, proper wattage, suffice, or is the filtering necessary? Rob ------------------------------ I suggest you look at this site for information http://www.powerstream.com/dc12-48.htm The NOSPIN Group is now offering Free PC Tech support at our newest website: http://freepctech.com