Battery charger circuits electronic circuits design

This portable solar charger circuit electronic project is designed using some common electronic parts .
As you can see portable solar charger circuit, is based on a LM358N operational amplifier and one transistor.

This regulator provide a constant 2.4 volts DC and can be used for powering small devices that needs to be powered from two AA battery cells .

A very simple Ni-cd battery discharge limiter electronic project can be designed like in this circuit diagram using few common electronic parts .

This cell phone charger circuit diagram electronic project is based on the FSEZ1307 third-generation primary side regulation (PSR) PWM controller integrated circuit .
The FEZ1307 cell phone charger can be used for battery chargers applications for devices like : cellular phones, cordless phones, PDA, digital cameras or for replacement of linear transformers and RCC SMPS .