I have made the above usb lamp.
The lights cannot be turned on when I use 2.4V rechargable battery, however, it is on when I use 3.6 recharable battery.
Besides, when I plug the usb lamp into computer’s usb port, it doesnt work..why is it like that? I try to find some information on 1n4007 datasheet . But I found nothing.
USB Lamp Circuit Diagram with Parts List.
USB port is only able to provide up to 100 mA current.So don’t overload the circuit with more no of LED’s.
Before wiring the circuit confirm the positive and ground leads of USB by a multimeter.
Switch S1 can be used to turn on the lamp.