Under a microscope, a silicon chip is a mysterious world with puzzling shapes and meandering lines zigzagging around, as in the magnified image of a 7805 voltage regulator below. But if you study the chip closely, you can identify the transistors, resistors, diodes, and capacitors that make it work and even understand how these components function together. This article explains how the 7805 voltage regulator works, all the way down to how the transistors on the silicon operate. And while exploring the chip, I discovered that it is probably counterfeit. more here........http://www.righto.com/2014/09/reverse-engineering-counterfeit-7805.html
![Die photograph of a 7805 voltage regulator.]( "Die photograph of a 7805 voltage regulator.")
Die photograph of a 7805 voltage regulator. Click to enlarge