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Q.

Why Automatic Gain Control circuit for volume control in any transistor is logarithmic and not linear... ???

Tags: education, computers & internet, automatic
Asked by Manoj M, 08 Apr '13 08:23 pm
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Answers (3)

 
1.

The automatic maintenance of a nearly constant output level of an amplifying circuit by adjusting the amplification in inverse proportion to the input field strength, also called automatic volume control (AVC). Almost all radio receivers in use employ AGC. In broadcast receivers, AGC makes it possible to receive incoming signals of widely varying strength, yet have the sound remain at nearly the same volume. In communications receivers a type of AGC circuit called a squelch circuit is used to prevent noise during periods of no transmission, such as in the reception of on-off keying, frequency-shift keying (FSK), and phone. AGC is also useful in accelerating the switching action between receivers in diversity connection. See also Radio receiver.
AGC action depends on the characteristic, possessed by most electronic tubes and transistors, of adjustment of gain by the variation of the applied bias voltage. If the dc voltage applied to the control grid of a vacuum tube is made more negati ...more
Source: Read more: http://www.answers.com/topic/automatic-gain-control#ixzz2PwGWgFIr
Answered by Quest, 09 Apr '13 10:23 am

 
  
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2.

A control circuit that automatically changes the gain (amplification) of a receiver or other piece of equipment so that the desired output signal remains essentially constant despite variations in input signal strength. Abbreviated AGC.
Answered by vedprakash sharma, 09 Apr '13 10:50 am

 
  
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3.

Itna science aur maths ka knowledge hota toh mein scinetist na ban jaata
Answered by Ataur Rahman, 08 Apr '13 08:24 pm

 
  
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