While on PDAs it is very important not to put other than full charged PDA on a Cambridge Model 20/25 as they are definitely limited internally as to the 5 volt they can supply. PDAs were not available when this unit was designed. The 302 does have enough ma available to slowly charge a low PDA. Ian M
2008/6/30 David Lawley <[EMAIL PROTECTED]>: > HI all, > > Regarding current draw with PDA backlights, I have done some limited > experimenting. > > An IPAQ 5500, with wired gps, without using Wi-Fi and bluetooth, and > starting with a near full charge, drew 168ma at full brightness, measured at > 12v input to 5v power supply. > > IPAQ HX4700, 80% charged, MAX 368ma @5v, so roughly 200ma @ 12v. (Similar > result to above). > > Units such as the Altair, with its big screen and powerful backlight may > draw more than this. (Nigel A would know exact figures I suspect) > > I always advise people to have their PDA as close to fully charged as > possible before placing in glider as the current draw can be up to 2 amps > from 5v (Approx 1 amp 12V) > when charging from dead flat. > > I would be very cautious using Li-Po batteries for the reasons others have > posted. Ni-Mh batteries seem to offer a reasonable compromise, particularly > for those who are up > against max weight of nonlifitng parts in a particular glider (Where even a > couple of kilograms could make a difference). Even L-ion batteries used in > laptops are not unknown to have overheating/fire hazard issues(See Sony, > Apple recalls). > > Regards > > DaveL > > ------------------------------ > at CarPoint.com.au It's simple! Sell your car for just $30 > <http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fsecure%2Dau%2Eimrworldwide%2Ecom%2Fcgi%2Dbin%2Fa%2Fci%5F450304%2Fet%5F2%2Fcg%5F801459%2Fpi%5F1004813%2Fai%5F859641&_t=762955845&_r=tig_OCT07&_m=EXT> > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring >
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