Another approach I keep meaning to try out, also for small loads, is a bathroom shaver outlet isolating transformer. Many, like the one in my junk box, also have the advantage of providing a choice of output voltages so that equipment designed for the other side of the Atlantic only can also be tested. (I last thought of this approach just after I blew the input fuse in a small SMPSU after somehow managing to confuse myself about which were the input rectifiers and which were the output rectifiers. But it was too late then so I didn't bother...) One thing that puts me off though is that I vaguely remember reading a report from someone who had a SMPSU that behaved even more bizarrely than these things usually do when it was powered through a less than ideal isolating transformer. Regards, Peter.