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Reverse engineering a counterfeit 7805 voltage regulator
posted September 12 2014 5:08.36 by Giorgos Lazaridis

Its the most standard part that each and every electronic enthusiast has used at least once. As popular as the 555 timer and the 741 op-amp, the 7805 voltage regulator is a 5V linear regulator found in all part bins. Ken Shirriff wrote a very detailed article about the 7805 theory of operation. And then he took it a step further:

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.

Its a very good and well written article that worth to read [link]

[Link: Ken Shirriff]

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