# Problem With Wien Bridge Sine Wave Oscillator Here Is The Circuit                                                  ## Problem With Wien Bridge Sine Wave Oscillator Here Is The Circuit

I have put up a circuit for Wien bridge oscillator using 741 op amp, with R= 390 ohm and C = 2.2nF, for operation around 200 khz ( gain is 4). However, it did not work so I switched the resistor in parallel branch with potentiometer. This is the closest I could get. Here is the circuit, with Rf = 8.2K and Rs = 2.2K

However, we can solve this problem with Wien bridge sine wave oscillator. Here is the circuit : This circuit uses the 2N3069 JFET as a voltage variable resistor in the amplifier feedback loop. The voltage reference for the peak sine wave amplitude is provided by the LM103 zener diode. It is fed and rectified to the 2N3069′s gate.

The Wien Bridge oscillator can still be built using similar principles to the early Hewlett Packard versions, but with modern components. Fig. 3.4.1 shows a basic Wien Bridge Oscillator using a filament lamp with an op amp.

In an LC oscillator, the very LC circuit produces sine oscillations and the amplifier only sustains them by adding additional energy; in an RC oscillator (Wien bridge here), the RC circuit cannot produce sine oscillations since it cannot reverse the direction of the voltage "movement" at the peaks.

22/08/2015 · The main difference between the general oscillator and Wien bridge oscillator is that in an oscillator, amplifier stage introduces 180 degrees phase shift and additional 180 degrees phase shift is introduced by feedback network so as to obtain the 360 degrees or zero phase shift around the loop to satisfy the Barkhausen criteria.

3.0 AF Sine Wave Oscillators Introduction Fixed Frequency RC Oscillators Single Frequency ... • Operation of the Wien Bridge Circuit. • The Variable Frequency Wien Bridge. • Development of the Wien Bridge Oscillator. Section 3.4 Wien Bridge Oscillators • Lamp Stabilised Wien Bridge Oscillator.

I have put up a circuit for Wien bridge oscillator using 741 op amp, with R= 390 ohm and C = 2.2nF, for operation around 200 khz ( gain is 4). However, it did not work so I switched the resistor in

10/05/2010 · This is a Sine Wave Oscillator circuit. This circuit as known as amplitude-stabilized sine-wave oscillator. ... this circuit provides optimum values for a general purpose oscillator. This circuit uses The Wien Bridge topology that is widely used in many applications. Here is the schematic diagram of the circuit: ... Here is the schematic ...

03/01/2017 · Hello, i am trying to design a wien bridge oscillator at 20khz and limited it to 2 Vpp. I don't understand why i get such a bad wave form out of the circuit and i …

Many past sine wave oscillators with tubes had insufficient bandwidth with high THD. Here are details of two I built which were much better than Hewlett-Packard's 1930s first Wien bridge AF oscillator that gave 30Hz to 30kHz. Many old variable F tubed oscillators used LC circuits which are not covered in …