# Questions tagged [wien-bridge]

Anything related to Wien bridge circuits. A Wien bridge is a particular bridge circuit configuration in which two sides of the bridge are purely resistive, whereas the other two are made up by resistors in parallel with capacitors. Wien bridges are commonly used in linear oscillators for producing sinusoidal signals.

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### Current across Wien bridge

I am trying to answer the question If you connect a detector between Va and Vb, knowing that the frequency to which the bridge is balanced is 6820,58Hz, what is the current that passes through the ...
65 views

### Wien bridge oscillator amplitude stability methods

I have read things about tungsten bulbs and its thermally controlled resistance. But what can I use for an electronics project will be builded on a breadboard. I searched for tungsten bulbs and all ...
84 views

### Sinusoidal waveform generator from DC

I am working on a project which requires me to create some sinusoidal signals at specific frequencies using a DC battery as the only power input. And I also want to tune the amplitude of the output ...
148 views

### wien bridge oscillator transfer function

I am trying to calculate the transfer function of a wien bridge oscillator but there is something wrong in my calculations. In the picture below there are my results from this calcultation. I am ...
160 views

### JFET stabilised wien bridge component ratios

I find myself in need of a sine wave oscillator and have decided on the wien bridge. I have followed all the tutorials but have a few questions that do not seem to be answered elsewhere. Firstly, I ...
110 views

### Transistor differential wein bridge oscillator wrong frequency

So I have created the attached Wien bridge oscillator using a transistor differential amplifier, the Negative gain is controlled using a potentiometer, center tapped and yes I understand that in the ...
97 views

### Vary the Vpp of sinusoidal oscillator

For an assignment I have to create a sinusoidal oscillator with 5 Vpp (centered around 0 V) oscillating at 10.0 kHz. The oscillator works as expected, at the right frequency, but the voltage needs to ...
81 views

### Electronic metronome Wien oscillator

I've got to analyze an electronic metronome schematic and I'm having trouble understanding how the oscillator in this schematic really works. I believe it's a Wien oscillator with variable output ...
462 views

### Measuring a varying capacitance using the Wien bridge

I am going to make a capacitive soil moisture sensor. The principal that I'm going to use is the change of capacitance of the soil with moisture. What I'm going to do is make a capacitor that would be ...
183 views

### Whats the equation to calculate the Vo-w and Vp amplitude of this Wien Bridge oscillator?

Im trying to find the equation to the amplitude of this wien bridge, if you could help me that would be awesome
51 views

### Wien Bridge Oscillator in Multsim Values

I am trying to build a Wien Bridge Oscillator in Multisim that has a frequency of 3.6 kHz. However my graph is very distorted and I'm guessing its because of the op amp component values. Does anyone ...
152 views

### Why spectrum analyzer ruined my oscillator's output?

I have been tried to investigate and fix this problem by myself. I however cannot find the solution. Please give me some advises. I used 3 traditional oscillator circuits with opamps (Wien bridge, ...
526 views

### Troubleshooting wien bridge oscillator circuit with 741 op amp

I built the standard Wien bridge oscillator circuit using the UA741CN op amp IC, however I am not getting any oscillation. I am powering this circuit with two 9V batteries. I'm using the values R1=...
157 views

### How to add a phase shifter to a Wien bridge oscillator

I need to add a variable phase shift circuit to my Wien Oscillator, I have done some research, but have only found phase shift oscillators made with 3 RC stages that generate a 180º shift. However, I ...
121 views

### How to decouple a negative feedback loop in DC?

My question is open ended, but I provided an example to explain the question better. R19 and R8 in the middle of the pic form a negative feedback loop. They set the gain of the amplifier. I need to ...
152 views

### Trying to build a Wien bridge oscillator, but can't make the oscillations work.

I built this circuit to have oscillations between 20kHz to 30kHz. Unfortunately the oscillations come out very tiny and very irregular. What should I modify or add and why to make the oscillations ...
518 views

### JFET Burn Out in Wien Bridge Oscillator

I have a simple Wien Bridge Oscillator (with JFET gain control) circuit pictured below. This circuit works as expected at lower voltages (+/-9 V), but I am running into some problems with higher ...
1k views

### Problems Building Variable Frequency Wien-Bridge Oscillator

I have been doing some experiments with Wien-Bridge Sine Wave Oscillators, specifically trying to make one where frequency can be controlled via a single knob, using a dual ganged potentiometer. I am ...
848 views

### Wien Bridge Oscillator Resonant Frequency cannot reached!

I am so bothered by the output frequency of my Wien Bridge oscillator because I cannot reached the resonant frequency which is given by f=1/2iπRC. FOR EXAMPLE: R = R1 = R2 = 1.5kΩ C = C1 = C2 = ...
786 views

### Wien Bridge Oscillator - LT Super Low Distortion Variable Sine Wave Oscillator Debug

I have been setting up a low distortion sine wave generator based on this design from LT (http://www.linear.com/solutions/1623): For resistors R1 and R2 I am using a ganged pot so that both change ...
1k views

### Great Voltage Stable Oscillator

i'm want to produce an AC signal an +-3.3V (or 3.3v-0) voltage supply with a small frequency around 1kHz-2KHz and a low output voltage too(200mV,for example), where the frequency stability is not ...
637 views

### How sine wave is generated in wien bridge oscillator? [closed]

It is known that the initial feedback signal is developed from the noise in the resitors and the transients of the power supply. The question here is : why the waveform at the output is sine wave ...
2k views

### Wien Bridge Oscillator with LM358

I am constructing 10kHz , 30kHz and 50kHz sine waves using wien bridge oscillator design with LM358 OP-Amp. I have a few problems with the circuits that i could not figure out. Thank you for all your ...
236 views

### Effect on opamp lead length for non-functional wien bridge oscillator

I've built two diode stabilised variable frequency wien bridge oscillator circuits according to this schematic: (source). Both are on the same stripboard and connect to a single LM324. One of the ...
1k views

### Wien bridge oscillator circuit doesn't work

I've connected the circuit of Fig 3.4.6 in this link which is shown below: Here is the circuit that I've connected: Where in my circuit: R3 = 100 kOhm R4 = 47 kOhm R1 = R2 = 5.1 kOhm C1 = C2 = 100 ...
468 views

### How can I build a dual potentiometer?

I am about to build a wien bridge oscillator circuit which is shown in the figure below: However, I need a dual potentiometer to do so, because the resistors VR1a and VR1b must have the same value ...
1k views

### Transistor Based Wien Bridge Oscillator

I've been studying the schematic for this RLC Bridge from Heathkit (IB-5281). The full pdf can be found here (search for the part number): http://www.vintage-radio.info/heathkit. The circuit ...
418 views

### Wien bridge sinusoidal oscillator

simulate this circuit – Schematic created using CircuitLab I would check that in the Wien bridge sinusoidal oscillator the gain A_V=1+(R5+R4)/R3) is actually A_V=3 as the Barkhausen stability ...
3k views

### How to calculate the amplitude of a Wien Bridge Oscillator? [closed]

How do I calculate the amplitude of the waveform that is created with this Wien Bridge Oscillator? My scope measurement shows 1V. My LTSpice shows ~.8V. Thank you.
4k views

### Problem in 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 ...
2k views

### Low frequency sinus generator

I would like to build a sinus frequency generator that can be controlled via an Arduino. Sinus frequency would be in the low frequency regime (below 100 Hz) with a voltage around 2.5 Volts peak to ...
4k views

### Problem with Wien's Bridge basic working and simulation in multisim

I am very new to the concept of Wien's bridge and am trying to make a basic circuit of it but didnt get the expected output (noise only).Tried to simulate on Multisim but got the same output.I have ...
3k views

### What is the function of the bulb in a Wien bridge oscillator?

In this answer it is said that the bulb in a Wien bridge oscillator is for temperature compensation. Is that true? (I thought it is a kind of AGC to stabilize the output level.)