1. Design a adjustable voltage regulator (5V to 15V) with a short circuit current limit of 50MA using a 723 regulator. (16 marks)(May/June 2013)

2. Draw the functional diagram of IC 555 Timer in astable mode and explain its operation and derive expression for frequency. (Nov/Dec 2012)

3. Explain with a schematic how a PLL can be used as (i) frequency multiplier. (8) (ii) frequency translator. (8) (Nov/Dec 2012)

4. Draw and explain the function block diagram of a 723 IC regulator and make the necessary changes to make it as low voltage regulator. (Nov/Dec 2012, May/June 2012, Nov/Dec 2008)

5. Write short notes on: (i) Opto couplers. (8) (ii) Switching regulators (8)Nov/Dec -2012, 2010, Apr/May 2008)

6. Design and draw the wave forms of 1KHZ square wave form generator using 555 Timer for duty cycle i) D=25% ii) D=50%.(May/June 2012)

7. Perform the closed loop analysis of PLL. Explain any two application of PLL.(May/June 2012)8. Write an explanatory note on: a. Power amplifier (8) b. Isolation amplifiers (8) (May/June 2012, Nov/Dec 2009)

9. (i) Explain the Working of VCO(8)(ii) What is PLL? Explain its application as frequency multiplier (8) (Nov/Dec -2011, 2010, 2009)10. (i) Explain the block diagram of ICL 8038 function generator IC. (8)(Nov/Dec- 2011, 2009, 2008) (ii) Write short notes on: Opto couplers. (8)(Nov/Dec 2011, Apr/May 2010)

11. Explain the astable and bistable operation of IC 555 with necessary waveforms.(Nov/Dec 2011)

12. Draw the functional block diagram of IC 555 Timer. Explain the operation of 555 Timer in mono stable mode with neat circuit and wave forms. (Nov/Dec 2010, Apr/May -2010, 2008)

13. Explain the working of series voltage regulator(8)(Nov/Dec 2010)14. Derive the expression for capture range for PLL where a RC network is used as LPF(Nov/Dec 2010)

15. With neat block diagram, explain IC566 VCO operation and discuss any two applications.(Apr/May 2010)

16. With a neat diagram, explain working principle of switch mode lower supply. (Apr/May 2010)

17. Write brief notes on IC MA 78 40(May/June 2010)

18. With block diagram explain the principle of operation of NE565 Phase Locked loop.(Nov/Dec 2009)

19. What are the various blocks that form a basic voltage regulator? List the advantages of IC voltage regulators. Explain the shunt voltage regulator.(Apr/May 2009)

20. Write short notes on protective circuits in regulators.(8) (Nov/Dec 2008)

21. (i) Explain the operation of PLL.ii) Discuss the application of PLL as frequency synthesizer.(Nov/Dec 2007)

22. (i) List the important features of 555 timer(ii) Explain the differences between the two operating modes of 555 timer(Nov/Dec 2007)

23. What are features of LM 380 power amplifier? Explain its application as high gain audio power amplifier.(Nov/Dec 2007)