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The Wien Bridge - Learn About Electronics
https://www.learnabout-electronics.org/Oscillators/osc33.php
Fig. 3.3.4 The Hewlett Packard 200C Wien Bridge Audio Oscillator Although the Wien Bridge had been around since 1891 it was not until 1939 that William Hewlett at Stanford University incorporated it into a practical audio frequency sine wave oscillator that has low distortion and a variable frequency and also a stable amplitude.
A simple "Wien bridge" audio oscillator
https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1946/10/page29/index.html
Fig. 1. Essentials of the "Wien bridge" oscillator circuit. Frequency is determined by the values of R and C; oscillation amplitude by the proportion of the output voltage fed back to the cathode of V1. The Wien bridge oscillator need be only a very simple device, as shown in Fig. 1.
Wien bridge oscillator - javatpoint
https://www.javatpoint.com/wien-bridge-oscillator
Wien bridge oscillator. Wien bridge oscillator is a type of phase shift oscillator which generates sinusoidal waves at the output. The Wien bridge oscillator was named after Max Karl Wien was based on the bridge circuit developed in the 1890s. It is one of the simplest oscillators known for its audio applications.
Budget Wien bridge oscillator with low THD | MyElectrons
http://myelectrons.com/wien-bridge-oscillator-low-thd/
At the power up the C3 is discharged and therefore VT1 channel is "open", resulting in the highest possible gain of approximately 3.5. That is just right for the circuit to start oscillating smoothly. High accuracy sine wave oscillator based on the Wien bridge. R1, R2 = 100 kOhm. C1, C2 = 1 nF = 1000pF. R4 = 10 kOhm. R3 = 3.9 kOhm.
Experiment No. 9 WIEN BRIDGE OSCILLATOR USING OPAMP
http://ee.cet.ac.in/downloads/Notes/ECLab/09-Wien%20Bridge%20Oscillator%20using%20OpAmp.pdf
Oscillator circuit must satisfy the following two conditions known as Barkhausen conditions: 1. Magnitude of the loop gain (Av β) = 1, where, Av = Amplifier gain and β = Feedback gain. 2. Phase shift around the loop must be 360° or 0°. Wien bridge oscillator is an audio frequency sine wave oscillator of high stability and simplicity.
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