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Shakeable dynamo: Trim and wrap the rectifier around the end of the biro | by Lucky Larry
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Shakeable dynamo: Trim and wrap the rectifier around the end of the biro

Neatens up the tube and means theres less chance for the circuit to be damaged when in use

 

More info here:

Building the alternator / dynamo

How the alternator works

Building the bridge rectifier

 

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Taken on September 2, 2010