Wien bridge
Wien bridge a bridge circuit where one arm is a series connection of a resistor and capacitor, another arm is a parallel connection of a resistor and capacitor (these two arms are called reactance arms), and two other arms (called ratio arms) are resistors. The balance detector is connected between the common point of ratio arms and the common point of reactance arms, a sinusoidal voltage source is connected to another bridge diagonal. The wien bridge was initially designed as a frequency measuring circuit, now the main part of its application is the wien bridge oscillator.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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