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In Reply to: RE: See ...."You're neglecting the behavior of capacitors" posted by Lew on March 8, 2011 at 13:33:08:
...I would think that an excellent case could be made for concern regarding PS Z at frequencies very much lower than 120Hz or even 20Hz.
Consider music with say a bass drum with a 20Hz resonant frequency being struck at a 1Hz interval. With most amp designs, the PS will have to contend with both 20Hz AND 1Hz. Unless the PS possesses a very low impedance at 1Hz, its output will be modulated at 1Hz regardless of the impedance at higher frequencies. Although it gets into semantics, in my mind a PS with a "fast recovery" almost by definition would be modulated by the 1Hz component and the result would probably be audible in the higher ranges.
Seems that the real question is how best to address the design for a power supply that maintains an acceptably low impedance over frequencies ranging from the infrasonic region to well beyond audibility.
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Follow Ups
- ...worried about Z @ 120Hz... - Steve O 17:25:22 03/08/11 (3)
- Thanks, Steve - Lew 20:22:24 03/08/11 (0)
- RE: ...worried about Z @ 120Hz... - drlowmu 17:43:10 03/08/11 (1)
- RE: ...worried about Z @ 120Hz... - Steve O 18:30:36 03/08/11 (0)
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