Hi Friends,
I am a newbie to electronics and really this electronics is getting interesting and interesting.
I want to build a portable battery charger for my cell phone.
Can anybody suggest how should i proceed, Because bike battery is having great voltage fluctuations. If you have a schematic ready then please please give it to me.
Rating of battery charger: 5V, 0.7A
Battery of motorcycle : 12V
What's wrong with just using a 12V DC car charger designed for your cell phone? They will tolerate a wide range of input voltages. If you are not burning out your headlight/turn/running lights, then the voltage fluctuation on your bike is well within the input range of a standard cell phone charger.
This chip is used in about 90% of the commercial 12Vdc input cell phone chargers, as well as power supplies for MP3s, XMRadio, etc. Last time I need a special voltage, I bought a retired 5V cell phone charger at a "garage sale" for $0.50, opened it up, changed one resistor, and I was good to go.