Bernard D. H. Tellegen

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Bernard D.H. Tellegen
Born (1900-06-24)24 June 1900
Winschoten, Netherlands
Died 30 August 1990(1990-08-30) (aged 90)
Eindhoven, Netherlands
Nationality Dutch
Institutions Philips Natuurkundig Laboratorium
Delft University
Alma mater Delft University
Notable awards IEEE Edison Medal (1973)

Bernard D.H. Tellegen (24 June 1900 – 30 August 1990) was a Dutch electrical engineer and inventor of the pentode and the gyrator. He is also known for a theorem in circuit theory, Tellegen's theorem.

He obtained a master's degree in electrical engineering from Delft University in 1923, and joined the Philips Natuurkundig Laboratorium (Philips Physics Laboratory) in Eindhoven. In 1926, he (and Gilles Holst[1]) invented the pentode vacuum tube. The gyrator was invented by him around 1948. The gyrator is useful to simulate the effect of an inductor without using a coil. For example, it is used in hi-fi graphic equalizers. He held 41 US patents.

In the period 1946–1966, Tellegen was an adjunct professor of circuit theory at the University of Delft. From 1942 to 1952, he was president and honorary member of the Netherlands Electronics and Radio Society.

The Australian Institute of Radio Engineers appointed Tellegen an honorary life member in 1953. He was Fellow of the IEEE, and he won the IEEE Edison Medal in 1973 "For a creative career of significant achievement in electrical circuit theory, including the gyrator". Tellegen was elected a member of the Royal Netherlands Academy of Sciences in 1960.[2] In 1970, the University of Delft conferred him a doctor honoris causa degree.[3]


  1. G. Holst and B.D.H. Tellegen, "Means for amplifying electrical oscillations", US Patent 1945040, January 1934.
  2. "Bernardus Dominicus Hubertus (II) Tellegen (1900 - 1990)". Royal Netherlands Academy of Arts and Sciences. Retrieved 17 July 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. "Bernard Tellegen". IEEE Global History Network. IEEE. Retrieved 25 July 2011.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>