In Reply to: RE: A tricky issue posted by Lew on October 12, 2010 at 22:48:33:
These are the (simulated) output spectra @ 1.2A peak current (in 8 Ohm speaker) of my dummy schematic with (top) and without (buttom) the 100 Ohm resistors.
As at 300 Hz negative feedback (with the 100 Ohm resistors) is working 'full steam ahead' the overall distortion is MUCH BETTER than without the 100 Ohm resistor.
And this is exactly as it should be according to known electrical theory, because negative feedback not only reduces output impedance but distortion too.
You can also see that in the case at hand odd distortion with zero feedback exceeds 0.1%, the supposed upper limit recommended by the still unknown/unpublished General Electric study of 1960 mentioned so many times by Ralph.
Best Regards
Luca
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- It is not a tricky issue at all - 6AS7_6SN7 01:14:20 10/13/10 (8)
- RE: It is not a tricky issue at all - Lew 07:03:14 10/13/10 (7)
- You are absolutely right! - 6AS7_6SN7 00:44:26 10/14/10 (6)
- RE: You are absolutely right! - Ralph 11:05:49 10/20/10 (3)
- RE: You are absolutely right! - Banat 05:28:04 10/21/10 (1)
- In this particular case I have found that.... - 6AS7_6SN7 11:35:59 11/28/10 (0)
- We made all the points quite clear....... - 6AS7_6SN7 23:56:08 10/20/10 (0)
- RE: You are absolutely right! - Lew 19:51:52 10/14/10 (0)
- RE: You are absolutely right! - Banat 10:10:48 10/14/10 (0)