Introduction to Direct Coupled Video Amplifier Construction:
It consists of a driver and an output amplifier. Q1 works as a driver amplifier and Q2 like output amplifier. A supply of i 2 Volts is provided by resistors to base and collector of device transistor. A supply of 110 Volts is concerned to the collector of output transistor through a resistor and a coil. The base of it is provided bias supply from 12 Volts supply by variable resistors VR, and VRy VR, and VR, works as a contrast and cub contrast controls correspondingly.
Circuit Operation:
The driver amplifier amplifies the 2V (p-p) video signal to approximately 4V(p-p) and fed it as output. The LG circuit at the emitter works as a trap to block the 5.5MHz below /if to prevent sound bars in diagram.
After that the video signal is applied to the base of Q2 via VR, Q amplifies the signal to maximum and sends that signal to the cathode of the picture tube. Vertical and Horizontals balancing pulses are delivered to the emitter of Q2 to cut off throughout retrace periods and so retrace lines are not to get better high frequency video signal response.
Peaking coil is employed to acquire better high frequency video signal response.
Beam current limiter is employed here. The brightness of picture tube becomes extremely high while the input video signal is not exist, in direct coupling method. Because of this, the life of picture tube is decreased. To control beam current Diode and 470K Resistor is required.
Contrast control VR1, ascertains the black, white and grey levels of picture and VR1 works as a sub contrast control. Preset is employed like the sub contrast control.
MERITS:
1. Extremely good high frequency response
2. The black, white and grey levels of picture is kept to a wanted level
3. Protects the picture tube via controlling beam current.
DEMERITS:
1. Regulated EHT supply is required. Because, at height white levels been current get increases and the result of it EHT voltage decreases. Consecutively, balancing takes place. A well regulated EHT supply decreases this effect.
2. Beam current limiter should be employed. Since the picture tube is driven to a high brightness level if the input video signal is not present and it decreases the life of picture tube.
3. Because of the extremely low frequency of the amplifier, a momentary flutter of the regenerate picture is resulted because of the fluctuating RF signal gain. When the passing of aero planes. In spite of a proficient fast acting AGC, this effect can't be eliminated totally.
Latest technology based Electrical Engineering Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in DC Video Amplifier Construction homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for DC Video Amplifier Construction, project ideas and tutorials. We provide email based DC Video Amplifier Construction homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in DC Video Amplifier Construction. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Electrical Engineering homework help and assignment help services. They use their experience, as they have solved thousands of the Electrical Engineering assignments, which may help you to solve your complex issues of DC Video Amplifier Construction. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
alkanoates tutorial all along with the key concepts of preparation of alkanoates: esterification, features or characteristics of alkanoates and uses of alkanoates
Enhance your academic grades and success with Populations Problems Assignment Help service with 24/7 support at economical rates.
Microscope and Specimen Preparation tutorial all along with the key concepts of The Microscope, Light Microscope, Bright Field Microscope, Dark-Field Microscope, Phase-Contrast Microscope, Fluorescent Microscope, Microscope Resolution and Electron Microscope
Class B Amplifiers tutorial all along with the key concepts of Class B amplifier operation, Input (DC) Power, Output (ac) power, Power Dissipated by Output Transistors, Class B Amplifier Circuit, Class AB Amplifiers, Crossover Distortion
tutorsglobe.com geothermal energy assignment help-homework help by online energy crisis tutors
Relativity of Mass tutorial all along with the key concepts of Variation of Mass with Velocity, Momentum and Force in Relativistic Mechanics, glancing collision
introduction to polymer chemistry tutorial all along with the key concepts of polymerisation processes, condensation polymerisation, plastics and resins and synthetic polymers
Theory and lecture notes of Vectors, Functions, and Plots in Matlab all along with the key concepts of Entering vectors, Plotting Data, Representation of a Function, Built-in Functions, User-Defined Inline Functions. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Vectors, Functions, and Plots in Matlab.
tutorsglobe.com complications of enteric fever assignment help-homework help by online salmonella tutors
theory of sequential circuit design all along with the key concepts of sequential circuit design, finite state machines, combinational logic, digital watch interface, homomorphic image. tutorsglobe offers homework help, assignment help and tutor’s assistance on sequential circuit design.
tutorsglobe.com modifications of adventitious roots assignment help-homework help by online root modifications tutors
gravitation and extended bodies objects tutorial all along with the key concepts of Gravitational Potential Energy, Escape Speed, Variation of g with Height and Depth, Variation of g with Latitude, Fundamental Forces in Nature
Theory and lecture notes of Sequences and Summation Notation all along with the key concepts of Defining a Sequence, Fibonacci Series, Factorials, Summation Notation and Properties of Summation. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Sequences and Summation Notation.
Natural Radioactivity tutorial all along with the key concepts of Radioactivity: Natural and Artificial, Neutron-Proton Ratio and Nuclear Stability, Types of Radioactivity, Particles Emission and Position of Stable Region
Phylum-Chordata tutorial all along with the key concepts of Features of Chordates, Protochordata, features of Vertebrates, categorization of Vertebrates, Developments in Vertebrates, Basic Chordate Body Plan, Adaptations of Fish and Maintenance Systems of fish
1934642
Questions Asked
3689
Tutors
1484380
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!