Thread: Nokia FCC filing reveals more details on next tablet
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lbattraw is offline lbattraw
2006-11-27 , 17:08
Posts: 209 | Thanked: 8 times | Joined on Nov 2005 @ Fishers, Indiana
#113
Originally Posted by Hedgecore
Totally off topic (but it'll end with a reply, so... heh). Does the 7805 drain the battery if nothing is plugged into the USB ports? Mine seems dead but I figured since there was no complete circuit... well.
Yep, the 7805 will happily drain your batteries dry with no load. For a LM7805 it uses 8 mA of power while idle so if you have a 150 mAH 9V rechargeable you can expect about 18 hours of life. I would suggest placing a LED (with 1K ohm resistor) across the output of the 7805 to remind you it's still quietly consuming power

Larry