Skill Subject: Electronics Technology

Part B: Vocational Skills

• Unit 1: Basic Occupational Safety and Precautions
• Unit 2: Microphones and Loudspeakers
• Unit 3: Recorders
• Unit 4: TV System
• Unit 5: Modern Appliances

1. Basic Occupational Safety and Precautions

2. Microphones and Loudspeakers

1. Construction, working principle and frequency response of Carbon Microphone, Variable Reactance Microphone, Capacitance Microphone, Piezo-Electric Microphone, Moving Coil Microphone.

2. Frequency ranges of musical instruments, Intensity and Dynamic Range, Constructions and working principles of Moving Coil Loudspeaker, Impedance and Power Level of loudspeaker, Frequency characteristics of Practical Loudspeakers: Woofer, Tweeter, Squawker, and Loudspeaker Enclosure.

3. Recorders

1. Analog and digital sound recording, Disk recording and reproduction, working principle with block diagram of disk recording and reproduction.

2. Principle of magnetic recording and playback, Requirement of bias,Working principle with block diagram of a tape recorder system.

3. Principle of optical recording, CD/ DVD manufacturing and recording, CD/ DVD player system, Advantages/ Disadvantages.

4. Steps for Fault finding & Analysis.

4. TV System

1. Working principle with block diagram of TV transmitter and receiver, Brief description with circuit diagram: TV Tuner, Video IF stage, Sound stage, Picture tube & its associated circuit, Synchronizing circuits, Horizontal & vertical deflection circuits, Remote control of a TV receiver, Idea of bandwidth, blanking and synchronization pulses, modulation scheme, monochrome system, extension of colour transmission.

2. Channel and cable type TV system, Head end processor, Trunk & cable distribution system with block diagram, Scrambling.

3. Introduction to LCD and LED TV systems, Introduction to high definition systems.

4. Steps for Fault finding & Analysis.

5. Modern Appliances

1. Working principle and block diagram of following: Microwave oven, Telephone, Fax machine, Printers, Scanners.

2. Steps for Fault finding & Analysis.