Preface - I don't know much about electronics :P
I have ordered a Shimano dynamo hub for my bicycle. I have done a little homework and here are my findings about it:
The output of the above mentioned dynamo is a 6 volt AC.
The output voltage of the dynamo is not stable, it varies based on the speed of the dynamo.
There are chances that the lights will blow up ;) Reason is because of non stabilized voltage output.
Based on the above I have few questions.
Is there a simple circuit which converts AC to DC output? I have read about some bridge rectifiers, but wanted to be absolutely sure about it. Also what size is the circuit, how easily it is available and how reliable it is?
Most important thing which I wanted to know, how do I built a circuit so that the 6 volt fluctuating AC output from dynamo to convert to a 5 volt (USB chargeable) stabilized DC output? Are there any already available? What is the cost of such circuit or how easily can I build from scratch?
I have read somewhere that plugging in a device to a non-stabilized input source (in this case the 5 volt output from dynamo to my iPhone) would blow off the device. So, if I could not achieve in building (or purchasing) the above mentioned point 2's circuit, can I use the 5 volt output to charge intermediate batteries like a spare Lithium Ion solar charger for iPhone and a AAA rechargeable batteries through a USB charger and use these to charge up my gadgets?