What do I need to be able to charge my bluetooth headset from my laptop's USB port instead from the DC adapter?
The DC adapter that came with the bluetooth head set puts out about 5.4V but I haven't been able to find the current. The adapter has no labels. I know that the output from a USB port is about 5V and my headset has a Li-polymer cell. I'm wondering if I could make a contraption that I could use to charge my bluetooth headset from my laptop's USB port?