BANNARI AMMAN INSTITUTE OF TECHNOLOGY

SATHYAMANGALAM

Department of Electrical and Electronics Engineering

ClassS3 EEE

Subject Code 11E107

SubjectELECTRON DEVICES AND CIRCUITS

Prepared ByK.Rajalashmi & N.Saravanakumar

Time:75 min

Lesson. No5/5 unit 4

1.Content List: Uni junction Transistor(UJT)

2.Skills Addressed: Reading, Questioning, Drawing mind map, Summarizing, Discussion, Drawing Diagrams, Expressing orally and in writing.

3.Objectives:To acceralrate the students to know about the basic concept of UJT oscillator, how the UJT oscillator works and they will be able to apply this knowledge wherever required.

4.Lesson Links:concepts of UJT oscillator

5.Alpha Breathing : (2 Mins)

The three steps for alpha breathing are

Breathe in

Breathe out

Hold

(Repeat the three steps for 8 times)

6.Evocation : (5 mins )

What is an oscillator? What is mean by frequency of oscillation?

7.Introduction:( 20-25 mins)Attached as power point presentation in Annexure I

8.Brain Activation: (2 mins) Any one of the following activities like

Right brain activities

Solving puzzles

Brain GYM

Optical Illusions

Perpetual calendar recalling

9.Survey and Reading by students: (15-18 mins)

Electronic Devices and Circuits Jacob., Millman, Christos C.Halkias

10.

Discussion: ( 9 mins)

The students will be asked to discuss the relevant topic among their team/other team/Faculty. The students those who have not taken part will be noted and kindle them to do.

11.Mind Map: (5-7 mins)

12.Summary: (5 mins)

UJT Oscillator Introduction

Examples

Construction and working

Working

characteristics Applications

13.Gazing/Rote memory: (2 mins)

A long and fixed look at the Mind map by the students before doing the presentation.

14.Assessment: 1

For generating 1 kHz signal, the most suitable circuit is

(A) Colpitts oscillator. (B) Hartley oscillator.

(C) Tuned collector oscillator. (D) Wien bridge oscillator.

ANS:

2

The use of crystal in a oscillator

(A) Improves frequency stability.(B) Increases the gain of the oscillator. (C) Helps to obtain optimum output impedance. (D) Facilitates generation of wide range of frequencies.

ANS:

3

An oscillator of the LC type that has a split capacitor in the circuit is(A) Hartley oscillator (B) Colpitts oscillator

(C) Weinbridge oscillator (D) R-C phase shift oscillator

ANS:

15.Learning outcomes:

By learning this topic the students will be able to understand the basic concept of UJT oscillator, how the UJT oscillator works and they will be able to apply this knowledge wherever required.

APPLICATIONS

Characteristics curve

Construction

OPERATION

UJT

OSCILLATOR

MIND MAP