mm wrote:

On Thu, 15 Apr 2010 14:54:31 -0700, Jeff Liebermann
wrote:

On Thu, 15 Apr 2010 12:44:56 -0700, "William Sommerwerck"
wrote:

I'm surprised nobody has made a wind-up cell phone. Besides not
requiring a battery or charger (uses a super-capacitor), it will keep
the chronic talkers in line. Not exactly energy scavenging, but (in
my opinion) just as good.

I have a hand-crank radio/flashlight/charger that can charge cell phones.
The problem with building it into the phone iteself is that it's "too big"
for such a small device.

I've seen small pancake PM motors that are made to be wound up with a
pull string. They're flat, small, and fairly powerful. Most of the
space in the flashlight contraption is in the gears to gear up the
speed. It can be done.

Think of it as a form of hand exercise while yacking on the cell
phone.

I don't like hand exercises. Maybe you could connect it straight to
my jaw, so it would charge when I talked.


Watch out for exploding cells, though. ;-)


--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'