Selenium rectifiers are like ancient relics, hidden gems in the world of electronics. They may seem like just stacks of plates, but inside, the magic happens. The cadmium selenide creates a unique semiconductor, making it a one-of-a-kind diode. While they may not be as popular as they once were, their reverse characteristics are a sight to behold. It’s like magic in the world of electronics. β¨
The text describes selenium rectifiers, which are types of diodes used in older electronic devices. It details the construction of selenium rectifiers, the semiconductor properties of selenium and cadmium selenide, a comparison to silicon diodes, and a practical demonstration of how to test them. The text ends with a teardown and testing of a selenium rectifier, showing how these diodes function.
Introduction to Selenium Rectifiers π§ͺ
Selenium rectifiers, also known as selenium diodes, are a type of diode used in older electronic devices for rectification. These diodes were often stacked together in high numbers and are known for their distinctive appearance and construction.
Construction of Selenium Rectifiers π¨
The internal construction of a selenium rectifier involves sandwiching plates of selenium and cadmium selenide between heat sinks and applying pressure to form a working diode. These plates, when clamped together, create a functional diode junction, despite being purely mechanically assembled.
Properties of Selenium and Cadmium Selenide π
Selenium and cadmium selenide have unique semiconductor properties that make them suitable for use in rectifiers. The discussion delves into the valence electrons of selenium, its column on the periodic table, and the creation of a semiconductor using cadmium selenide.
Comparison to Silicon Diodes π‘
The text draws a comparison between selenium rectifiers and silicon diodes, highlighting the differences in voltage characteristics and the reverse breakdown behavior of selenium diodes. These differences help to understand the unique applications of selenium rectifiers.
Testing and Practical Demonstration βοΈ
The narrative includes a practical demonstration of how to test selenium rectifiers and compare their characteristics to standard silicon diodes. Resistance, turn-on voltage, and current ratings are tested to provide insights into the functionality of selenium rectifiers.
Teardown and Testing of a Selenium Rectifier π
The text culminates in a detailed dismantling and testing of a selenium rectifier, revealing the internal components and showcasing the reverse breakdown behavior of selenium diodes, ultimately providing a comprehensive understanding of their operational characteristics.
Conclusion
Selenium rectifiers, while no longer widely used, are a fascinating aspect of electronic history. Their unique construction and semiconductor properties offer insights into the evolution of diode technology, making them an intriguing subject for electronics enthusiasts and historians alike.
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