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Old 6th November 2013, 12:13 AM   #1
diyAudio Member
 
Join Date: Nov 2013
Default Negative feedback?

Hi,
I'm trying to learn a little about amplifiers and had a couple of questions about negative feedback. They might seem a bit simplistiic to most of you but anyway...when a speaker is connected to the output of an amplifier, is it in the feedback loop? I understand that speaker damping is a property of the amount of negative feedback so is the speaker is in the loop? What about things like the output zobel or a coupling cap?
Thanks for your time!
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Old 6th November 2013, 12:36 AM   #2
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Location: Skokie Il
Quote:
Originally Posted by Tacbob View Post
when a speaker is connected to the output of an amplifier, is it in the feedback loop?
With the exception of motional feedback designs or back emf from the loudspeaker, no.

Quote:
What about things like the output zobel
No.

Quote:
coupling cap
Usually not.
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Old 6th November 2013, 12:19 PM   #3
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
The NFB "loop" is from the output tapping point to the input injection point.
That loop is usually inside the amplifier.

All the other bits both before and after the amplifier are outside the loop.
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regards Andrew T.
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