12 a) With necessary diagrams explain the working of class A transformer coupled (8)

amplifier and obtain the maximum overall efficiency. b) What are its advantages and disadvantages
(2)
13 a) Compare different types of multistage amplifiers. (5) b) With a neat circuit diagram explain

the operation of Colpitt’s oscillator using (5)

BJT. (8)
14 a) Define the following terms

1) CMRR 1) Slewrate iii) Input bias current _(iv) Input offset voltage (2)

b) Give the typical values of above parameters for 741 IC

PART D
Answer any twofull questions, each carries 10 marks. (6)
15 a) Expl ain the operation of Op-Amp integrator and differentiator circuits. (4)

b) Explain the working and design of a triangular wave generator circuit with
necessary diagrams. (6)
16 a) What are the features of instrumentation amplifier? Derive the expression for
output voltage of an instrumentation amplifier. (4)
b) Design the feedback circuit of a Wein Bridge oscillator with 2MHz output
frequency.
With the help of internal circuit diagram of IC555 explain the operation of 0

astable multivibrator.Derive the expression for frequency of oscillation.

ಸಸ್ಯ KK

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