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TRANSISTOR PHASE SHIFT OSCILLATOR
CIRCUIT DIAGRAM:
THEORY:
The Transistor Phase Shift Oscillator produces a sine wave of desired designed frequency. The RC combination will give a 60° phase shift totally three combination will give a 180° phase shift. . The BC107 is in the common emitter configuration. Therefore that will give a 180° phase shift totally a 360° phase shift output is produced. The capacitor value is designed in order to get the desired output frequency. Initially the C and R are connected as a feedback with respect to input and output and this will maintain constant sine wave output. CRO is connected at the output.
DESIGN:
Given : Vcc = 12V , fo = 1 KHz,C = 0.01µF; IE = 5mA.; Stability factor = 10
f = 1/ 2πRC Find R
R1 = (Ri - R)
R >> Rc
Βeta = -1 / 29
Amplifier Design :
Gain formula is given by
Av = -hfe RLeff / hie ( Av = 29, design given )
Assume, VCE = Vcc / 2
RLeff = R c | | RL
re = 26mV / IE
hie = β re where re is internal resistance of the transistor.
hie = hfe re
VE = Vcc / 10
On applying KVL to output loop,
Vcc = IcRc + VCE + IERE
VE = IERE
Rc = ?
Since IB is very small when compared with Ic
Ic approximately equal to IE
RE = VE / IE = ?
VB = VBE + VE
VB = VCC . RB2 / RB1 + RB2
S = 1+ RB / RE
RB =?
RB = RB1|| RB2
Find RB1 & RB2
Input Impedance, Zi = (RB || hie )
Coupling and bypass capacitors can be thus found out.
Input coupling capacitor is given by , Xci = Z i / 10
Xci = 1/ 2pf Ci
Ci = ?
output coupling capacitor is given by ,
Xc0 = 1/ 2pf Co
Co =?
By-pass capacitor is given by, XCE = 1/ 2pf CE
CE =?
What else can I help you with?
How does the phase-shift oscillator get its name?
The phase-shift oscillator gets its name from the phase-shift network used in its design, which introduces a phase shift in the feedback path of the circuit. This phase shift is necessary for maintaining oscillations in the circuit.
How to design a phase shifter circuit using operational amplifier to have a desired phase shift?
There are many phase shift oscillator circuits on the internet. Google search, `phase+shift+oscillator+schematics` and `phase+shift+oscillator+diagrams`. Generally, if you want to change the phase shift characteristics, you'll need to substitute some fixed resistors with variable resistors and depending where they're placed, you can either change the operating frequency or the waveform characteristics.
Why only 60 degrees phase shift in RC phase shift oscillator?
In order for an oscillator to be stable, its total phase shift must be 180 degrees. The most common design of an RC phase shift oscillator is three identical RC stages in series, which means that each stage contributes 60 degrees. For more information, please see the Related Link below.
Why is the R-C oscillator also called a phase shift oscillator?
The R-C oscillator is also called a phase shift oscillator because the R-C filter creates a phase shift from input to output. The feedback portion of the oscillator (an amplifier) then serves to pump energy back into the filter.
How would you explain phase shift oscilater?
A phase-shift oscillator is a linear electronic oscillator circuit that produces a sine wave output.
How do you design phase shift oscillator circuit with amplitude stabilization?
you ask professor smith from the UNH ECE department
What is type of oscillations?
Phase-shift oscillator Armstrong oscillator Cross-coupled LC oscillator RC oscillator
Phase shift oscillator?
haha fink
Is RC phase shift oscillator more stable than a crystal oscillator or not?
no
How many emitter stage is needed to build up an RC phase shift oscillator and wien bridge oscillator?
In an RC phase shift oscillator, one emitter follower stage is typically used to provide the required phase shift. In a Wien bridge oscillator, two emitter followers are used to achieve the required feedback and oscillation.
Which is better RC phase shift oscillator or wien bridge oscillator?
phaseshift of wienbridge is 0
Derivation of frequency expression of phase shift oscillator?
b
