By far, the largest number of switching PS are those in computers. Unless you leave the computer running, they are NOT on as the wall warts. My $0.02 worth. Bob - N0DGN On 11/27/2012 7:59 AM, David C. Hallam wrote: > Do switcher PS continue to draw current whether or not they are in use > as do wall warts? > > David > KC4DH >