Unit-5 January – 2014 5. What is a monostable multivibrator? Explain with the help of a neat circuit diagram the principle of operation of a monostable multivibrator, and derive an expression for pulse width. Draw the wave forms at collector and Bases of both transistors. 5. What is a astable multivibrator? Explain with the help of a neat circuit diagram the principle of operation of a astable multivibrator, and derive an expression for pulse width. Draw the wave forms at collector and Bases of both transistors. 5. a) With the help of a neat circuit diagram explain the working of an emitter coupled Astable multivibrator and derive an expression for the gate width b) Design an astable multivibrator to generate a square wave of 5 kHz frequency with a duty cycle of 25%. 5. a) Describe multivibrators from the viewpoints of construction, principle of working, classification based on the output states, applications and specifications. Mention one specific application of each. b) Design a monostable multivibrator to generate an output pulse of 250 μs duration. Assume hFE (min) = 25, ICE (sat) = 5 mA, VCC = 10V and VBB = - 4V April/May – 2013 5. a) Derive the expressions for Slope error, Transmission error and displacement error. Establish the inter-relationship among them. b) Draw the circuit diagram of Bootstrap time base generator and explain the Operation with the help of waveforms. 5. a) Explain in detail about basic principles of Miller and bootstrap time-base generators. b) With the help of a neat circuit diagram, explain the working of a simple current sweep. 5. a) With the help of a neat circuit diagram, explain the working of a transistor miller sweep. b) With the help of a neat circuit diagram, explain the working of a transistor current time- base generator. 5. a) Explain briefly about different methods of generating time-base waveform. b) Discuss in detail about correction of linearity through the adjustment of driving waveform for a current time-base waveform. December-2011 / January-2012 5.a) Draw a bootstrap sweep circuit using Darlington pair. Explain its operation with neat waveforms; also mention its merits and limitations? b) Briefly describe various methods to achieve sweep linearity in time-base circuits 5. Define sweep speed error, transmission error and displacement error pertaining to sweep circuits. Also derive the expressions for the same with respect to an exponential sweep circuit 5.a) Draw the circuit of a constant current sweep circuit, explain its operation and derive the expression for sweep voltage. b) Explain the principle of working of Miller sweep circuit. Derive the expression for sweep speed by taking Miller integrator circuit. Dec – 2012 5. a) With the help of a neat circuit diagram, explain the working of an emitter coupled monostable multivibrator. Derive an expression for the gate width of monostable multivibrator. b) Design an astable multivibrator to generate a square wave of 2 kHz frequency with a duty cycle of 35%. 5. a) Draw and explain the working of a collector-coupled Astable multivibrator. Derive the expression for frequency of oscillation. b) Calculate the component values of a monostable multivibrator developing an output pulse of 500μs duration. Assume hFE (min)=25, ICE (sat) =5mA, VCC=10V,and VBB = -4V. 5. a) Explain the operation of a collector-coupled monostable multivibrator with the help of a neat circuit diagram and waveform. Derive an expression for the gate width. b) A collector –coupled monostable multivibrator using n-p-n silicon transistors has the following parameters. VCC = 12 V, VBB = 4 V, RC = 1 k_, R1 = R2 = R = 15 k_, hFE = 35, r’bb = 220 _ and C = 1000 pF. Neglect ICBO. i) Show that in the stable state one transistor is ON and the other is OFF. ii) Find the width of the output pulse. 5. a) Draw the circuit diagram and explain the working of an astable multivibrator with the necessary waveforms. b) Design a one shot circuit to produce a pulse width of 5 msec. Assume hFE =30, VCE(sat)=0.3V, VBE(sat)=0.7V, IC=5 mA, VCC=6V,VBB=1.5V,Q1 ON and Q2 OFF.
Posted on: Wed, 13 Aug 2014 17:25:10 +0000
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