Introduction to AVC (Automatic Volume Control)
An automatic Volume control is used in radio receiver additionally to the manual volume control. It gives stability to the output.
FADING
Differences in the signal strength are termed as fading in radio reception. The signal that received through the antenna changes continuously. Since the signals arrives at the receiving aerial from the transmitting antenna by ionosphere. Because the density of ionosphere alters continuously, the signal voltage also changes continuously. Therefore, an instable output sound would be generated in the receiver. An automatic volume control (AVC) is used to remove the fading.
AVC circuit is categorised into two types as expressed below:
1. Simple AVC Circuit
2. Delayed AVC Circuit
SIMPLE AVC CIRCUIT
The automatic volume control that stay exists in every time is called simple A.V.C. Its standard is relies on changing the bias that is applied to RF and IF stages. The AVC bias changes as per to the signal strength. The bias is much more at high signal strengths and less at low signal strength.
WORKING
The AVC network is involved in the detector circuit. A resistor and a bypass capacitor are employed in this network. As per to the polarity of detector diode the bias is built. Because diode is opposite biased, negative bias is built and stored within the AVC bypass capacitor.
The voltage of AVC bias is applied to the bases of RF and IF transistor. This bias relies on the signal strength . While the signal strength is usual. AGC bias voltage is also general and the result, the sound in the speaker is as well general.
While high signal strength is acquired, much more bias (negative) is built that reduces the gain of RF and IF stages. In opposition, while low signal strength is acquired, lessbiasis developed that raise the gain of RF and IF stages. As the result, in stable output sound from the speaker despite of changing signal voltage.
DEMERITS
1. It slowly decreases the gain of RFand IF stages
2. From weak radio stations the audio cannot be heard clearly
AUDIO AMPLIFIER
The Amplifier that amplifies the frequency that range of 20 Hz to 20 Kilohertz is termed AF amplifier. Usually audio amplifier is split as power and voltage amplifiers.
Latest technology based Electrical Engineering Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Automatic Volume Control homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Automatic Volume Control, project ideas and tutorials. We provide email based Automatic Volume Control homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Automatic Volume Control. 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 Automatic Volume Control. 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.
www.tutorsglobe.com offers Labour Variances homework help, assignment help, case study, writing homework help, online tutoring assistance by accounting tutors.
thermistor digitals usually comprise “built in” sensors and probes. they have to be calibrated throughout the manufacturing process and thus are not interchangeable.
Modern Examples of Evolution tutorial all along with the key concepts of Sickle-cell Anaemia, Industrial Melanism, Chloroquine - Resistance Malaria Parasite, Pesticide-Resistance Insects, HIV, Phylogenetic categorization of Organisms
www.tutorsglobe.com offers Overhead Variances homework help, assignment help, case study, writing homework help, online tutoring assistance by accounting tutors.
Chemical Components of Soil tutorial all along with the key concepts of Characteristics of Rocks and Minerals, Weathering, Physical Weathering, Biogeochemical Weathering, Soil analysis, Chemical Analysis of Soil, Interpretation of Soil Analysis and Benefits of Soil Analysis
Relationship between Vegetation and Climate tutorial all along with the key concepts of Climate-vegetation Interaction in Sahara, Vegetation and Climate, Influence of Vegetation on Soil Type
tutorsglobe.com hemophilia assignment help-homework help by online inborn errors of metabolism tutors
String to Number Conversions-Assignment help and Homework help along with the key concepts of atoi Function, atol Function, atof Function, Character Test Functions and Mathematical Functions
The loss and profit statement and balance sheet and another financial report can then be generated using the ledger accounts listed in the trial balance.
tutorsglobe.com software complexities assignment help-homework help by online software engineering tutors
A dead tissue is known as Sclerenchyma. The cells comprise lignified secondary walls. They not have protoplasts.
Chemical properties of Carbohydrates tutorial all along with the key concepts of Reactions involving Carbohydrates, Osazone Formation, Chain Shortening and Lengthening and Formation of Glycosides
theory and lecture notes of finite automata with external storage all along with the key concepts of finite automata with external storage, concepts of finite automata, conventions of finite automata, notation of finite automata. tutorsglobe offers homework help, assignment help and tutor’s assistance on finite automata with external storage.
tutorsglobe.com proteins assignment help-homework help by online nutrition tutors
Heredity and Environment tutorial all along with the key concepts of Probability in Genetics, Probability to the Formation of Gametes, Formation of Offspring in Humans, Formation of Offspring in Plants
1954233
Questions Asked
3689
Tutors
1454783
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!