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.
Theory and lecture notes of Polynomial time reducibility all along with the key concepts of polynomial time reducibility, Complexity P & NP, polynomial-time, polynomial-time reducible. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Polynomial time reducibility.
Paramecium tutorial all along with the key concepts of Physical Appearance of paramecium, paramecium Feeding, Respiration process in Paramecium, Movement in Paramecium, Reproduction and Importance of paramecium
The current day computer though has also goes through rapid change throughout the last fifty years. This period, throughout that the evolution of computer took place can be separated into five different phases termed as Generations of Computers.
tutorsglobe.com composting methods assignment help-homework help by online recycling of waste tutors
Quantitative-Polygenic Inheritance tutorial all along with the key concepts of Continuous Variation, Other Considerations and quantitative inheritance
The Phylum Annelida tutorial all along with the key concepts of characteristics of Annelida, Diversity of annelids, Classification of annelids, Class Polychaeta, Class Oligochaeta and Class Hirudinea
Magnetism tutorial all along with the key concepts of Magnetization, Diamagnetism, Paramagnetism, Ferromagnetism, Curie-Weiss Law, Spontaneous Magnetization, Domain Theory of Ferromagnetism, Bloch Wall, Antiferromagnetism
Theory and lecture notes of Recovery Management all along with the key concepts of Model of Errors, Model of Storage Errors, page transfer, Model of Data Communications Errors. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Recovery Management.
In order to perform the operations that mentioned above the computer allocates the work between its several functional units.
Nature and Chemistry of Transition Elements tutorial all along with the key concepts of Electronic Configuration of transition elements, General Characteristics of Transition Elements and Periodic trends in properties
Sexual reproduction, above and beyond producing individuals, introduces variability in the offspring through combining traits of parents.
score impeccable grades and get appreciation from professors with data warehouse-data mining assignment help at feasible prices.
theory and lecture notes of static characteristics i all along with the key concepts of ideal inverter, logic voltages, drive capability, noise immunity, switching speed and bipolar transistor switch. tutorsglobe offers homework help, assignment help and tutor’s assistance on static characteristics i.
Metallurgy tutorial all along with the key concepts of Types of Furnaces used, Steps involved in Metallurgical Operations, Ore Dressing, Extraction of Crude metal and Purification of Metals
tutorsglobe.com stereoisomerism assignment help-homework help by online isomerism tutors
1955491
Questions Asked
3689
Tutors
1477208
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!