I’m thinking about dynamo, but usb chargers for 6V hub dynamo are either expensive or shit. I think I’m going to DIY it in the nearest future. Below is definitely an easy option. Tempting… We’ll see
Smart phones are quite power hungry, especially if you use features like GPS or continuous data streaming. After a couple of hours navigation or tracking a training ride, it’s time to start looking for a charger. If you mobile charger happens to be that of the USB type there are some options to get your phone juiced up en route, both commercial and DIY. We did an online search for words dynohub USB charger and among the DIY crowd basically two types of designs popped up.
One idea is to use a set of four NiMH cells to regulate the voltage from the hub generator and, in to the bargain, also provide intermediate power storage allowing removing of the battery pack and using it for charging or power source also off-board.
The other option is to use a low-voltage-drop 5-volt regulator to directly feed the USB power source. The following…
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