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(5)
PART D
Answer any 2 questions. Each question carries 10 marks.
15. a) Draw the circuit diagram of an astable-multivibrator using 555 timer to generate the
output signal with frequency 2 KHz and duty cycle of 75 %. (5) b) What

are the advantages and features of instrumentation amplifier? Derive the expression for
output voltage of instrumentation amplifier. (5)
16. ൭൧൦5 a Wein bridge oscillator circuit to produce a 100KHz, + 9Voutput. Design
amplifier to have closed loop gain of 3. (5)
b) What is the function of precision rectifier circuits? What is the significance of UTP and
LTP in Schmitt trigger circuits? (5)
17. a) Discuss how logarithmic amplifier is realized with op-amp circuitry. (5)
b) What is the basic principle of RC oscillators? Design a phase shift oscillator to oscillate at

500Hz. (5)

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