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A selenium rectifier is a type of metal rectifier, invented in 1933. [1] They were used in power supplies for electronic equipment and in high-current battery-charger applications until they were superseded by silicon diode rectifiers in the late 1960s.
A number of rectifier discs would need to be used in series to provide an adequate reverse breakdown voltage figure – a bridge rectifier for a 12V battery charger would often use 12 metal rectifiers. Selenium rectifiers were generally more efficient than metal-oxide types, and could handle higher voltages.
Selenium rectifier. Once common until replaced by more compact and less costly silicon solid-state rectifiers in the 1970s, these units used stacks of oxide-coated metal plates and took advantage of the semiconductor properties of selenium or copper oxide. [22]
Selenium rectifiers were first used in 1933. They have mostly been replaced by silicon-based devices. They have mostly been replaced by silicon-based devices. One notable exception is in power DC surge protection , where the superior energy capabilities of selenium suppressors make them more desirable than metal-oxide varistors .
These selenium rectifiers were used (and are still used) to convert alternating current to direct current in electrical power applications. During 1925–1940, diodes consisting of a pointed tungsten metal wire in contact with a silicon crystal base, were fabricated in laboratories to detect microwaves in the UHF range.
It's an excellent source of high-quality, lean protein that’s packed with essential vitamins and minerals, including zinc, selenium, potassium, B vitamins and more.
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