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Fleming valve
English Wikipedia - The Free Encyclopedia
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Fleming valve
The
Fleming valve
, also called the
Fleming oscillation valve
, was a
vacuum tube
(or "thermionic valve") invented in 1904 by
John Ambrose Fleming
as a
detector
for early
radio receivers
used in
electromagnetic
wireless telegraphy
. It was the first practical
vacuum tube
and the first
thermionic diode
, a vacuum tube whose purpose is to conduct current in one direction and block current flowing in the opposite direction. The thermionic diode was later widely used as a
rectifier
— a device which converts
alternating current
(AC) into
direct current
(DC) — in the
power supplies
of a wide range of electronic devices, until largely replaced by the
semiconductor diode
in the 1960s. The Fleming valve was the forerunner of all vacuum tubes, which dominated electronics for 50 years. The
IEEE
has described it as "one of the most important developments in the history of electronics", and it is on the
List of IEEE Milestones
for
electrical engineering
.
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