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C1155 Pages:

PART D
Answer any two full questions, each carries 9 marks.
Design an RC Coupled Amplifier using transistors with the following
specifications :
Vee = 12 V de, [८ = 2 mA, hfe = 125, Lower cut off frequency = 100 Hz, Upper
cut off frequency = 100 KHz.
What are the effects of cascading on the gain and bandwidth of transistor
amplifier circuits.
Sketch and explain a Wein Bridge Oscillator using transistors. Explain how
conditions for sustained oscillations are satisfied in this circuit.
With neat sketches and waveforms, explain the working of an Astable
Multivibrator using transistors.
PART E
Answer any four full questions, each carries 10 marks.
Draw and explain the circuit of a differential amplifier.
Realise an active first order high pass filters using OPAMPS for a lower cut off
frequency of 1 KHz and a pass band gain of 2.
Derive an expression for voltage gain of an inverting and non-inverting
operational amplifier.
Compare active and passive filters.
Draw and explain a sample and hold circuit. Quote a few of its applications.
Explain the terms CMRR and Slew Rate of an OPAMP. Also specify the typical
values for IC 741.
Draw and explain the circuit of a Schmitt Trigger using OPAMPS. Explain the
terms UTP and LTP of a Schmitt Trigger.
Compare binary weighted and R-2R ladder D/A Converters.
Draw and explain the circuit of a summing amplifier using OPAMP. Realise
Y(t) = 5 Vit 2 V2—4V3 where ۷۱, V2 and V3 are input magnitudes.
Sketch and explain the circuit of a monostable multivibrator using IC 555.
Explain the circuit of a Wein Bridge Oscillator using OPAMPS
Design an Astable Multivibrator using IC 555 for a frequency of operation
2 KHz and a duty cycle 60%.

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