Propeller Head Plaza

Posted by mfc (A) on July 01, 2003 at 18:58:45

In Reply to: Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) posted by john curl on July 01, 2003 at 15:59:38:

Hello,

>First, it has a very low intrinsic output impedance.

Yes, relative to an 8 ohm speaker load, an emitter follower
built with some beefy transistors could make 8 ohms seem like
a light load. That means it doesn't have to "put out" all that
much. Seeing that light loading causes harmonics to go way down
in an emitter follower, I can see that this would give an emitter
follower a chance to perform well.

What bugs me though is this inherent problem that the load is
part of the feedback loop. I'm kind of wondering into uncharted
territory when I start thinking about frequencies where feedback
isn't exactly 180 degrees and the effect this has. Any thoughts
or references along these lines would be welcome. One general
question is: What effect does feedback have when it isn't
exactly 180 degrees?

Mike

• Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - kurt s 22:02:39 07/01/03 (8)
  • PS - kurt s 22:29:04 07/01/03 (0)
  • Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - mfc 22:25:41 07/01/03 (6)
    • Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - Scott Frankland 01:43:17 07/02/03 (4)
      • Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - mfc 18:34:52 07/02/03 (3)
        • Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - Scott Frankland 19:41:37 07/02/03 (2)
          • Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - mfc 22:15:08 07/02/03 (1)
            • Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - Scott Frankland 23:42:07 07/02/03 (0)
    • Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - kurt s 22:33:03 07/01/03 (0)