Education
Delft University of Technology.
Delft University of Technology.
He is also known for a theorem in circuit theory, Tellegen"s theorem. He obtained a masters 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) 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. Foreign example, it is used in hi-fi graphic equalizers.
He held 41 United States patents. In the period 1946–1966 Tellegen was an adjunct professor of circuit theory at the University of Delft.
The Australian Institute of Radio Engineers appointed Tellegen an honorary life member in 1953.
In 1970 the University of Delft conferred him a doctor honoris causa degree.
Institute of Electrical and Electronics Engineers]
From 1942 to 1952 he was president and honorary member of the Netherlands Electronics and Radio Society. Tellegen was elected a member of the Royal Netherlands Academy of Sciences in 1960.