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Twin T Oscillator

The document outlines the design and observation of a Twin-T oscillator using Multisim, which generates a sine wave output without external input. It explains the theory behind the oscillator, its components, and the procedure for creating and testing the circuit. The results indicate successful generation of a sine wave with a measured frequency of approximately 1,149.4 Hz, closely matching the theoretical value of 995.6 Hz.

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230 views6 pages

Twin T Oscillator

The document outlines the design and observation of a Twin-T oscillator using Multisim, which generates a sine wave output without external input. It explains the theory behind the oscillator, its components, and the procedure for creating and testing the circuit. The results indicate successful generation of a sine wave with a measured frequency of approximately 1,149.4 Hz, closely matching the theoretical value of 995.6 Hz.

Uploaded by

aimansadiyab4u
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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PROJECT WORK

Twin-T Oscillator
Aim: To design a Twin-T oscillator and to observe its output waveform.

Apparatus: Multisim

Theory:

The Twin-T oscillator is a type of RC (resistor-capacitor) oscillator that


generates a sine wave output without requiring any external input signal. It
is widely used in audio frequency applications due to its simplicity and
effectiveness in producing stable sinusoidal waveforms.

The oscillator gets its name from the twin "T"-shaped RC networks—one
forming a low-pass filter and the other forming a high-pass filter. These two
filters are combined to create a notch filter, which is then used in a feedback
loop with an amplifier. When the total phase shift around the loop is zero and
the loop gain is unity, oscillations occur at the notch frequency of the RC
network.

Where R and C are the resistor and capacitor values in the T-network. The
circuit typically uses operational amplifiers for providing the necessary gain
to sustain oscillation.

Procedure:

1. Turn ON the computer and open the Multisim application.


2. Create a new file and design the Twin-T oscillator circuit using
appropriate resistor and capacitor values.
3. Connect the function generator if needed to test the frequency
response (though no external signal is required for the oscillator to
operate).
4. Use a virtual oscilloscope (CRO) to observe the output waveform at the
output of the operational amplifier.
5. Adjust the component values if needed to fine-tune the oscillation
frequency.
6. Record the waveform characteristics such as frequency, amplitude,
and stability.

Table of Observations:

Resis Capaci Theoretical Measured Practical Output


tance tance Frequency Time Period Frequency Waveform
(R) (C) (Hz) (µs) (Hz) Type
10 kΩ 16 nF ~995.6 Hz 870 ~1,149.4 Hz Sine Wave

Observations:

1. The output waveform was observed as a clean sinusoidal wave.


2. The frequency closely matched the theoretical value calculated using
the formula.
3. Oscillations were self-sustained without requiring an input signal.
4. Slight component variations affected amplitude but not frequency
significantly.
Result:

A Twin-T oscillator circuit was designed and simulated. The circuit


successfully generated a sine wave output. The theoretical frequency of
oscillation was approximately 995.6 Hz, and the practically measured
frequency based on waveform time period was approximately 1,149.4 Hz.

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