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File:Dynamotaschenlamperp.jpg

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English: Small crank driven, human muscle powered dynamo flashlight - case opened to show the parts. A switch connects the 2 LED lamps (top left) to a battery (center left) which is charged by the electric generator (lower left) with the help of the small diode. Turning the black fold-away crank at 60 rpm (=1/sec) drives the 72:1 step-up gear and lets the generator rotate at 4320 rpm. A few minutes of cranking probably provides 10-15 minutes of light.
Source Stromgenerator
Author Berklas
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current15:48, 1 November 2008Thumbnail for version as of 15:48, 1 November 2008820 × 628 (129 KB)Berklas (talk | contribs){{Information |Description={{en|1=Small dynamo driven flashlights. Data: 2 LEDs; Gear transmission ratio: 70; max crank frequency: 60 rpm -> 4000 rpm at dynamo. }} |Source=Own work by uploader |Author=Berklas |Date= |Permission= |other_v

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