In Reply to: RE: ALT. 1. posted by 91derlust on January 9, 2015 at 15:58:04:
"I am rather new to this (surprise!), but I am wondering: what are the technical and sonic implications of the impedance peak in the "audible" range. How does it affect what is produced at the speaker drivers?
Does the increased impedance affect the ability to deliver current or affect the voltage at a given frequency? How does this translate sonically?"
A very good question. I've spent some time today learning some of the basics of how to use SPICE, and I think I've succeeded in modelling a reasonably realistic power supply, with an applied load corresponding to the kind of thing that would arise with a class A single ended amplifier. It seems to confirm more or less the same qualitative features discussed already, in the case of a drlowmu style power supply with small values for the chokes. Namely, some sort of a resonance in the low audible spectrum, resulting in quite a strong modulation of the power supply voltage. Whether it is enough to be audible, I really don't know. But since he says he hears a difference with his power supplies, and since this modulation of the supply voltage seems to be a fairly robust feature of the models, perhaps these two things are indeed correlated.
Chris
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Follow Ups
- RE: ALT. 1. - cpotl 20:55:49 01/10/15 (18)
- RE: ALT. 1. - Garg0yle 21:03:19 01/10/15 (17)
- RE: ALT. 1. - drlowmu 20:08:08 01/11/15 (0)
- RE: That's what my friend says when he built this supply - deafbykhorns 12:02:50 01/11/15 (0)
- RE: ALT. 1. - drlowmu 11:55:54 01/11/15 (14)
- RE: ALT. 1. - cpotl 12:08:42 01/11/15 (13)
- RE: ALT. 1. - GEO 12:23:17 01/11/15 (12)
- RE: ALT. 1. - cpotl 12:30:35 01/11/15 (11)
- RE: ALT. 1. - Garg0yle 12:41:12 01/11/15 (0)
- Two questions, easy to answer .... - drlowmu 12:36:59 01/11/15 (9)
- RE: That appears to be Slagle's transformers in the first picture - deafbykhorns 16:17:59 01/11/15 (6)
- RE: That appears to be Slagle's transformers in the first picture - drlowmu 20:18:11 01/11/15 (5)
- RE: Slagle's transformers did that amp Justice!! - deafbykhorns 14:18:19 01/12/15 (4)
- RE: Slagle's transformers did that amp Justice!! - dave slagle 15:10:00 01/12/15 (3)
- RE: Slagle's transformers did that amp Justice!! - mqracing 13:06:03 01/17/15 (0)
- Correct Dave ... - drlowmu 16:17:37 01/12/15 (0)
- RE: Just noticed the black laminations-yours are - deafbykhorns 16:07:38 01/12/15 (0)
- RE: Two questions, easy to answer .... - cpotl 13:16:36 01/11/15 (1)
- RE: Two questions, easy to answer .... - GEO 13:54:21 01/11/15 (0)