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... pulling up a mass and letting it drop (slowly with the help of gears) to run a generator. Has anyone here seen anything like this to operate, say, a small radio?
.... if I can haul up a 10kg mass 2 meters ...wouldn't that be:98N x 0.002m/s = 0.196W
Well, I just checked and one source says that cranking the crank for 1 minute gives you about 4 minutes of radio play. I guess that makes sense considering the numbers. They are certainly not as efficient as I thought.
Geezer's no power radio sounds like a good idea, as long as you don't mind using ear buds.
And yes, a mass suspended about 2 meters high is about a dangerous as a high bookshelf or a potted plant on a balcony. People who find themselves needing to use an emergency radio may be willing to take this crazy risk though.
Think of this like dropping a bowling ball onto your foot - the weight of the ball compresses (squashes) the tissues of your foot against the floor. This force of this weight being dropped can rupture blood vessels, causing bruising, and even break bones. Dropping a bowling ball onto the stomach could compress the bowel, causing it to rupture, spilling the contents into the abdominal cavity and becoming a major source of infection.
Your 10Kg weight suspended from some improvised attachment close to the ceiling is certainly more hazardous than using AA batteries.
Quote from: CliffordK on 29/07/2012 01:18:57Geezer's no power radio sounds like a good idea, as long as you don't mind using ear buds.As long as it's an AM signal. FM reception might be impossible without "power assist".
It's perfectly possible to receive an FM signal on an AM radio. You just detune it slightly. The official name for this is "slope detection"
I've seen hand crank radios that were supposed to store energy in batteries or capacitors. But, they never seemed to be very effective. And, of course solar radios.I thought I had heard of a record lathe that was powered by weights, but I don't see any notes on the internet, and I can't remember which band it was in reference to.
No, I am not talking about some miracle energy device, I am talking about pulling up a mass and letting it drop (slowly with the help of gears) to run a generator. Has anyone here seen anything like this to operate, say, a small radio?