Audio Oscillator

Posted on Feb 5, 2014

A Wien bridge oscillator produces sine waves with very low distortion level. The Wien bridge oscillator produces zero phase shift at only one frequency (f = 1/2 P RC) which will be the oscillation frequency. Stable oscillation can occur only if the loop gain remains at unity at the oscillation frequency. The circuit achieves this control by using

 Audio Oscillator
Click here to download the full size of the above Circuit.

the positive temperature coefficient of a small lamp to regulate gain (RF/RLAMP) as the oscillator attempts to vary its output. The oscillator shown here has four frequency bands covering about 15 Hz to 150 kHz. The frequency is continuously variable within each frequency range with ganged 20 k ohm potentiometers. The oscillator draws only about 4. 0 mA from the 9-V batteries. Its output is from 4 to 5 V with a 10 k ohm load and the RF (feedback resistor) is set at about 5% below the point of clipping. As shown, the center arm of the 5 k ohm output potentiometer is the output terminal. To couple the oscillator to a dc type circuit, a capacitor should be inserted in series with the output lead. (Texas Instruments, Linear and Interface Circuits Applications, Vol 1, 1985, p. 3-15 and 3-16. )

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Power amplifier
    Simplest atmega8 programmer Using LPT Port
    Laser1 RoboBrick
    sound activated lamp relay switch
    room noise detector
    HS-3182 ARINC 429 Bus Interface Line Driver Circuit
    Motor Y starting circuit shape
    Notch filter circuit diagram MC33171
    Bad book is not binding circuit