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A simple "Wien bridge" audio oscillator
https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1946/10/page29/index.html
The frequency of oscillation is determined by the values of R and C, and in the case where the Rs are equal and the Cs are equal. It doesn't matter from the standpoint of waveform exactly what proportion the Rs and Cs bear one another (because the circuit will balance with nearly any values) just so long as when the values are chan…
Wien Bridge Oscillator - Tutorialspoint
https://www.tutorialspoint.com/sinusoidal_oscillators/sinusoidal_wien_bridge_oscillator.htm
Another type of popular audio frequency oscillator is the Wien bridge oscillator circuit. This is mostly used because of its important features. This circuit is free from the circuit fluctuations and the ambient temperature.
Wien Bridge Sine Wave Oscillator ... - Electronics Notes
https://www.electronics-notes.com/articles/analogue_circuits/operational-amplifier-op-amp/wien-bridge-sine-wave-oscillator-generator.php
The Wien bridge oscillator is one that has been around for many years, and it finds applications in many areas as an audio oscillator, either using discrete electronic components, or using operational amplifiers. As op amps are such easy electronic components to use, providing near perfect operation, they are widely used in circuits like these.
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.
Wien Bridge Oscillator - WatElectronics.com
https://www.watelectronics.com/wien-bridge-oscillator-circuit-operation/
Wein Bridge Oscillator is a two-staged RC coupled amplifier circuit. It has a feedback loop with a series R 1 C 1 circuit, also known as a High-pass Filter circuit, connected to a parallel R 2 C 2 circuit, also known as a Low-pass Filter circuit. This connection forms a selective second-order frequency-dependent Band-pass filter.
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.
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