- #1
colintonks
- 17
- 0
Hi,
I am wondering if you can help:
I have a hub dynamo that I would like to use to charge my mobile for a cycle ride across europe.
The DC hub dynamo produces anything up to 40volts at full pelt!
So I want to use a car charger to charge my mobile phone (and one for a camera), which I assume takes a maximum of about 14volts.
Problem is that any voltage >14volts will surly fry the car charger.
So is is possible to have a simple circuit, say some form of relay that will 'open' the circuit at >14volts thus disconnecting the car charger and preventing damage.
I have had a good look around the web and yes I have found some stepdown transformers, however many of them don't handle high voltage and are also expensive.
Is there a simple solution, i.e. some sort of relay or am I clutching at straws!
Thanks
Colin
I am wondering if you can help:
I have a hub dynamo that I would like to use to charge my mobile for a cycle ride across europe.
The DC hub dynamo produces anything up to 40volts at full pelt!
So I want to use a car charger to charge my mobile phone (and one for a camera), which I assume takes a maximum of about 14volts.
Problem is that any voltage >14volts will surly fry the car charger.
So is is possible to have a simple circuit, say some form of relay that will 'open' the circuit at >14volts thus disconnecting the car charger and preventing damage.
I have had a good look around the web and yes I have found some stepdown transformers, however many of them don't handle high voltage and are also expensive.
Is there a simple solution, i.e. some sort of relay or am I clutching at straws!
Thanks
Colin