In Reply to: RE: Power amplifier posted by Zefiro on November 2, 2007 at 03:55:36:
>>As every people advise me to build an NFB amp so why not build one amp with tons of NFB (something like in Peter Baxandall papers says 40 dB).<<
LARGE amounts of NFB that include the O/P trafo in the loop make the amp highly vulnerable to both O/P trafo core core saturation and slew limiting. :>( Think of the GARGANTUAN error correction signals involved at both frequency extremes.
What you want to use is cicuitry that's reasonably linear open loop. Then, a few dB. of loop NFB will improve damping factor and linearize your questionable Chinese O/P trafos. NFB is a tool that can easily be abused.
Eli D.
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Follow Ups
- RE: Power amplifier - Eli Duttman 15:11:42 11/03/07 (1)
- RE: Power amplifier - Zefiro 12:17:39 11/04/07 (0)