Solar energy is renewable, free, widely available and clean form of energy. It is considered as a serious source of energy for many years because of the vast amounts of energy that is made freely available, if harnessed by modern technology. Many people are familiar with so-called photovoltaic cells, or solar panels, found on things like spacecraft, rooftops, and handheld calculators. The cells are made of semiconductor materials like those found in computer chips. When sunlight hits the cells, it knocks electrons loose from their atoms. As the electrons flow through the cell, they generate electricity. In this project, we are building a power bank which harvests energy by using a solar panel. The energy gained by the solar panel is stored in a LiPo battery. Then the battery is used to supply a stable 5V which is used by USB gadgets. The power bank can also be charged by an external 5V source. The best thing for this power bank during day that you don’t need to remember to charge it. It charges itself by using the sunlight and you don’t come up with an empty bank.

     DIY Bench Power Supply
     1.3 - 32 V / 5A Power Supply with Short Circuit Protection
     Dual Adjustable Power Supply
     1.5V - 30V 1.5A LM317 Variable Power Supply
     1.2 - 12V / 1A Low Voltage LED Indicator Power Supply with LM317
     10A 1-30V Variable Power Supply with LM317
     LM317 Variable Power Supply
     LM317 Constant Current Source Circuit Design
     12V 2A Linear Power Supply
     LM317 Overvoltage Protection

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