According to James Holland on Wed, 01/23/13 at 13:02: >=20 > I would also suggest that you take a closer look at the wall wart. Thanks. I can certainly do that... :-) > A few years ago I had problems with a PC Scope, I turned it on one > time and it was constantly resetting and running very hot, I sent > it back under warranty and it was returned no fault found. On closer > examination I realised that I had picked up a different 12V DC wall > wart. When I checked them both with a scope, my original wall wart > gave a smooth 12V output and the other gave a square wave output > with an average DC voltage of around 12V - the scope was not happy with t= hat!=20 I don't know what a "PC Scope" is, sorry. But once I put an oscilloscope on the (alleged) 4.5 VDC the true nature of this wall wart should be revealed. This sounds like my next step. :-) Regards, web... --=20 William Bulley Email: web@umich.edu 72 characters width template ----------------------------------------->| --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .