Logic-Circuits
Sequential-Statements
Shift-Registers
Experiment No: 07
Title: Design, build and test Op Amp based Wein Bridge oscillator for given frequency.
AIM : Design, build and test Op Amp based Wein Bridge oscillator for given frequency.
APPARATUS REQUIRED:
Op-amp IC 741, Dual trace supply, Function Generator, Resistors, Capacitors, CRO, Probes
THEORY:
Equations Related to the Experiments:
a) Wein Bridge Oscillator
Closed loop gain Av = (1+Rf/R1) = 3
Frequency of Oscillation fa = 1/(2pRC)
DESIGN:
Gain required for sustained oscillation is Av = 1/b = 3
(PASS BAND GAIN) (i.e.) 1+Rf/R1 = 3
\ Rf = 2R1
Frequency of Oscillation fo = 1/2p R C
Given fo = 1 KHz
Let C = 0.05 mF
\ R = 1/2 p foC
R = 3.2 KW
Let R1 = 10 KW \ Rf = 2 * 10 KW
Circuit Diagram:
Model Graph:
OBSERVATION:
Peak to peak amplitude of the output = Volts.
Frequency of oscillation = Hz.
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