RC Phase Shift Oscillator, Circuit Diagram|Experiment | Breadboard| Diploma| Btech

RC Phase Shift Oscillator Lab experiment. For Engineering/Diploma Students Electronic Circuits Lab
AIM
To setup RC phase shiftoscillator for 1 KHz and
(i) plot the output waveform
(ii) measure the frequency of oscillation
EQUIPMENTS / COMPONENTS
Sl. no. Name and specification Quantity
1. Capacitor 0.01 μF 3 nos.
1 μF 1 no.
22 μF 1 no.
2. Resistor
470 Ω 1 no.
1.8 KΩ 1 no.
4.7 KΩ 2 nos.
10 KΩ 1 no.
47 KΩ 1 no.
3. Variable resistor -
Potentiometer (lin)
10 KΩ 1 no.
4. Transistor BC 548 1 no.
5. Power supply 12 V 1 no.
6. Oscilloscope 0 to 20
MHz
1 no.
7. Multimeter 1 no.
8. Breadboard 1 no.
9. Connecting wire
PRINCIPLE
An oscillator is an electronic circuit for generating ac signal voltage with a dc supply as the
only input requirement. The frequency of the generated signal is decided by the circuit elements. Anoscillator requires an amplifier a frequency selective network and positive feedback from the output othe input. The Barkhausen criteria for sustained oscillator is Aβ = 1, where A is gain of the amplifierand β is the feedback factor.
If common emitter amplifier is used with resistive collector load, there is an180o phaseshift between input and output. The feedback network introduces an additional180o phase shift at a particular frequency. The three section RC network offers 180o phaseshift and the β of 1/29. Hence for unity gain feedback, the gain of the amplifier should be 29. The phaseshift oscillator is particularly useful as audio frequency generator. The frequency of oscillation is given by
1/(2πRC√6) .
PROCEDURE
1) Test the components
2) Assemble the amplifier part of the circuit in a breadboard
3) Connect the feedback network
4) Connect the output of the circuit to an oscilloscope
5) Adjust the 10 KΩ pot and observe the output
6) Measure the frequency and amplitude of the output
7) Plot output waveform
OBSERVATIONS
1. DC conditions of amplifier section
(i) VCC =
(ii) VBE =
2. Output waveform
Time period, T =
Frequency, f =1/T =
(iii) VCE =

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Dear Sir, Can you please explain how to use an oscilloscope in the next video? Thanks in advance!

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