13

14

15

16

17

b)

C7115

A transformer coupled classA power amplifier draws a current of 250mA from a
collector supply of 13 V. When no signal is applied to it determine i) Maximum
output power ii) Power rating of the transistor iii) Maximum collector efficiency.
With a neat diagram explain the working of a Hartley oscillator.
A Wien bridge oscillator has the following components Rj = 1२०८ R4= 5.6 kQ, २३
= 12 kQ and (1 = (2 2000pF. Calculate the oscillating frequency.
Derive the expression for voltage gain of a dual input balanced output differential
amplifier.
Why open loop op amp configurations are not used for linear applications?
PART D

Answer any two full questions, each carries 10 marks.
Draw and explain the operation of a square waveform generator using opamp.
Explain inverting Schmitt trigger circuit with relevant waveforms.
Draw and explain the circuit of IC 555 in Monostable mode with relevant
waveforms.
What are the advantages of crystal oscillators.
Explain the working of Instrumentation amplifier with a neat diagram.
In an astable multivibrator using 555, Rg = 750 Q. Determine the values of Ra
and C to generate a 1.0 MHz clock that has a duty cycle of 25%.

یا بد عاد 3

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