Originally Posted by sandozer
Be careful there Rob, if the regulator cant handle the extra current you may finish up with 12v going straight to the phone, it may work now but be seriously overloaded. As you have shorted the data lines the phone will draw around 800ma (I have measured this ) Be safe and get a yourself a 1amp capacity USB adapter.
It is supposed to be 1amp capable (see Micro DC to USB Adaptor : Caravan & Camping : Maplin
) but since I don't want to toast my shiny new Desire it's worth checking, thanks.
I'll first need to work out a way of getting to the connections so I can insert an ammeter and attach a voltmeter.