Bernard D. H. Tellegen
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) 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 ...
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Winschoten
Winschoten (; gos, Winschoot) is a city with a population of 18,518 in the municipality of Oldambt in the northeast of the Netherlands. It is the largest city in the region of Oldambt in the province of Groningen which has 38,213 inhabitants. Winschoten received its city rights in 1825. It was a separate municipality until it was merged into Oldambt in 2010. The seat of government of Oldambt is in Winschoten. There are three windmills and several churches in Winschoten. There is a railway station with direct connections to Groningen and Leer (Germany). Winschoten has an important role as a shopping centre for the region of Oldambt. In the province of Groningen, it is the second-largest shopping destination and it attracts many consumers from nearby Germany. Etymology The origin of the name of Winschoten is not known but it has received nicknames. One of these is ''Molenstad'' (or ''Milltown''). It has also been known, in living memory, as Sodom. This name arose o ...
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