poxkix
Member level 5
I want to design a circuit for a cellphone charger. I have found lots of circuits in the net but I can't find a suitable output enough to charge a 3.7v cell phone battery. I tried using 7805 regulator because it is the closest to 3.7v, how do I make the 5v output lower to 3.7v? By the way the power source is a 12v battery 100A. Thanks