Forgive me but I am a bit of a novice when it comes to building electronics. I am making a usb charger that will take 6-9 v via batteries. Possibly more. I bought a 5v regulator and rigged it up. I have two issues.
First, the regulator gets way hot. I actually found this forum by googling my problem, the solution there with a greater input was to add some resistor or something. I was wondering what exactly it is I need to add based on my power source being 6-9 v. If at all possible I would like to have the ability to use a larger power source, and I can not have a heat sink as this is basically just a cable.
Problem two is a bit harder to find answers to.. as is, my cable is able to take 6-9 v and take it down to 5, and successfully power every usb device I have except for one- my phone. It even powers my old phones.. but not my Motorola DROID x2. What might the reason for this be?
First, the regulator gets way hot. I actually found this forum by googling my problem, the solution there with a greater input was to add some resistor or something. I was wondering what exactly it is I need to add based on my power source being 6-9 v. If at all possible I would like to have the ability to use a larger power source, and I can not have a heat sink as this is basically just a cable.
Problem two is a bit harder to find answers to.. as is, my cable is able to take 6-9 v and take it down to 5, and successfully power every usb device I have except for one- my phone. It even powers my old phones.. but not my Motorola DROID x2. What might the reason for this be?