According to Sean Breheny on Thu, 01/24/13 at 15:46: > > The short-circuit current of a fresh AA cell is probably almost 10 > Amps. It can definitely source more than 1.5 amps with a voltage well > above 1 V. I don't know how many LEDs are in this tapestry so it is > difficult for me to judge how much current I would expect it to draw, > both on average and in terms of peak pulse value. How long do the AA > cells typically last while powering this? Not very long at all... :-( That's what got this whole effort started. :-) > By the way, I think that alkaline batteries are pretty amazing. I have > measured the short circuit current of a Duracell alkaline D cell at > something like 20 Amps and if I remember correctly, it sustained more > than 10 Amps for several minutes. Wow! > Even more amazing, a D cell is about a 13 Amp-hour battery! Compare > the size of 8 D cells to a 12V, 13 Amp-hour lead acid battery. Of > course, the lead acid battery is rechargeable but still, I think the > volumetric and gravimetric energy and power density of alkaline cells > is impressive. I agree. :-) 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 .