This ‘solar’ PSU having been designed for this purpose right from the start, the elements it composes are integrated to a higher extent, leading to improved efficiency. Our suggested circuit is intended to power a number of current electronic devices directly, and can provide three different voltages: 3.3 V, 5 V or 12 V, depending on component selection; all at a current of 400 mA, which can even be increased to 1 A if necessary.