|
Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
|
|
|
Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
|
In Reply to: Semantics posted by 13th Duke of Wymbourne on August 25, 2014 at 16:21:25:
any gain stage is constructed using local feedback to reduce the open loop gain of the active component. The real issue is the source of the feedback and any potential phase shift between the input and the output, where the feedback is taken from. This can be a problem even within a single stage, if there is enough reactance between the input and output of the stage, At high frequencies one even has to consider the Miller capacitance of the active device to avoid oscillation and compensation has to be made in the design of the stage, but we are talking GHz designs where that is a real issue. No-Feedback is a marketing term that has nothing to do with reality :). When manufacturers talk about a zero feed back design what they really mean is ZERO GLOBAL FEEDBACK. One of the liveliest sounding preamp i had is a Sao Win design...it has 2 ic stages in it...He sanded the identification off of one of them so to keep his sauce a secret...unfortunately it makes it impossible to repair it. So far he has not given me another set of the sanded off ICs to fix my preamp that developed a strange oscillation problem.The biggest challenge with a phono preamp is the power supply design, no matter what the active components are.
P.S. Here is an interesting read from Nelson Pass
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Edits: 08/26/14 08/26/14 08/26/14
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- You cannot build an amplifier with no feedback - Penguin 19:49:11 08/26/14 (10)
- RE: You cannot build an amplifier with no feedback - bjh 17:36:41 08/27/14 (0)
- Correct - I should have said Global Feedback - 13th Duke of Wymbourne 16:53:28 08/27/14 (4)
- :)~ - Penguin 17:45:04 08/27/14 (3)
- RE: :)~ - fscerri 02:03:21 08/28/14 (2)
- RE: :)~ - bjh 17:58:28 08/28/14 (1)
- I love your signature line... - Penguin 18:46:09 08/28/14 (0)
- Interesting - Mark Kelly 20:36:48 08/26/14 (3)
- Do you have a resistor between a the source and ground? - Penguin 20:56:14 08/26/14 (2)
- So it is possible to build an amplifier with no feedback after all? - Mark Kelly 22:57:52 08/26/14 (1)
- Now we are splitting splitting hairs :) - Penguin 06:12:56 08/27/14 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
