Correct me if I'm wrong (everyone else), but most cell phones, these days, are charged through the USB port. So, all you have to do is supply 5 volts DC, with enough current (500ma max) through a standard USB connection.
Just Google: "usb connector pinout" for a pin out diagram.
I have 1 emergency cell phone charger but its usb and i am trying to plugin with my 1 external charger but i think due to low voltage its not picking up. Anybody can let me know please that how many voltage are required for usb?
The discussion focuses on creating an easy and low-cost circuit diagram for a cellphone charger. Most modern cellphones charge via a USB port requiring a 5V DC supply with a current capacity up to 500mA, delivered through a standard USB connection. USB connector pinout diagrams are recommended for reference. Some phones may use different voltages, such as 3.7V, depending on the model. Latest mobile phone chargers typically employ Switched-Mode Power Supply (SMPS) technology. A detailed circuit diagram and explanation are available from Electronics For You and Engineers Garage websites. Users also inquire about the required USB voltage for charging and request PCB layouts for practical implementation. Summary generated by the language model.
