According to John Ferrell on Wed, 01/23/13 at 13:= 20: > > Two important pieces of information needed: > > 1- Does the Tapestry still work OK with batteries? Good question. I understood that this would be a good "debug" step, but I would have to undo the solder joints and put the battery clips back into place so the AA cells would fit back into the plastic "power pack". > If not, plan repair options. If it does, don't mess with it! Indeed. :-) > 2- IMHO, 4.5 volts is a little high for 3 alkaline cells. Hmmm... I could have sworn that AA cells were 1.5 Volts. Not NiMH, of course, but alkaline I thought sure would be. I will have to check. > Brand new & fresh carbon zinc cells would measure that. Maybe that's where I went wrong. When I was a kid, there were no other choices than carbon zinc batteries (well, there were those mercury coin cells for electric watches...). > Measure the wall wart to see if it is still ok. I don't think I need to do that (other than use an oscilloscope to see how "smooth" the 4.5 VDC is...) since the tapestry continues to work after some time powered down and disconnected from everything... > According to Energizer & Wikipedia 1.5 volts is nominal for both=20 > types of cells. Interesting... > Hopefully, the wall wart died... NOOOO!!!! Then I would have to go back to step one (the beginning)! :-( But the wall wart seems to be fine (I never detected any heat coming out from its case) and the tapestry does work after some time off. 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 .