CityCyclingEdinburgh was launched on the 27th of October 2009 as "an experiment".
IT’S TRUE!
CCE is 15years old!
Well done to ALL posters
It soon became useful and entertaining. There are regular posters, people who add useful info occasionally and plenty more who drop by to watch. That's fine. If you want to add news/comments it's easy to register and become a member.
RULES No personal insults. No swearing.
"Actually I don't have many photos of the trip. I made a charger using a circuit from the internet so that I could charge my camera phone from the front hub dynamo. This worked well for a while before cooking my phone down a long decent!"
Posting on a Moulton Forum.
Bike in question (touring Switzerland)
"I am happy to report that my 1963 bicycle performed superbly with no problems whatsoever other than punctures. The F-frame really is an awesome load carrier"
"I made a charger using a circuit from the internet"
I think I've spotted where he/she went wrong.
""I made a charger using a circuit from the internet"
I think I've spotted where he/she went wrong."
Must have had a REALLY long cable...
I am tempted to make a solar charger from 4 solar powered garden lights and an old USB extension cable, put the lot inside plastic pocket folders (like for CCG geeks) and seal them up... I would never trust a dynamo.
"I would never trust a dynamo"
to do?
The thing about dynamos is that their voltage isn't entirely linear - doesn't keep going up with speed.
The voltage also depends on load - which is why, if you've ever used one, you'll know that if one bulb goes, the other is likely to soon after!
I suspect the charger wouldn't have been a particularly high load, and whoever designed the circuit wouldn't have allowed for the fact that it was going to be used on a small wheeled bike (on very steep hills...)
Fairly simple to get around if your not interested in efficiency. An LM7805 can take up to about 37v input with a smallish heat sink and out put a good, clean, constant 5v. Any power over 5v gets expelled as heat.
Hook that up to the dynamo along with a simple bridge rectifier made from 4 diodes and you have exactly the same 5v you get on your USB.
They use these chips in most pc power supplies.
@chdot - to charge a phone or other expensive device, lights yes.
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