
USB to Nokia Safe Charger
This simple project shows you how to make a USB powered Nokia cell phone charger. The advantage is that it weighs much less than the bulky AC adaptor, and can be used wherever you have a computer or a laptop. I use this thing all the time now!
What do I mean by “safe charger”? Honestly I’m not sure. I’m just going on what I was able to infer from what I read off my multimeter. What I found was that the voltage across the nokia charge pins was rapidly fluctuating from Vdd to about 4 volts above Vdd. It would not do to have ~9 volts injected into a 5 volt bus! Thankfully, all you need to do is stick...