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RE: Flywheels and Low DCR

Posted by Triode_Kingdom (A) on October 12, 2016 at 10:34:12

In Reply to: RE: Flywheels and Low DCR posted by deathtube 667 on October 12, 2016 at 08:24:34:

Just to elaborate, back when the sole proponent of this nonsense was exclaiming its virtues in nearly every post on this forum, I simulated all the designs using the values he himself described. Every one I tested was absolute garbage, nothing I would ever use as a power supply for audio amplifiers. The problem has to do with output Z, something that particular person doesn't understand and lacks the skill to analyze.

Further on this subject, I've been analyzing power supply performance in some detail over the last few months. It does seem extraordinarily difficult to produce a truly smooth output response when inductance of almost any size or DCR is present in the design. The best that can be hoped for is to push the anomalies to frequencies below 20Hz, but then one has to deal with subsonic sensitivities that might be excited by sources other then the amplifier stage.

One of the best types of supplies I've tested is the HK voltage doubler. Output Z is low and very smooth over frequency, and the contribution this makes to dynamics in real world listening is apparent. Unfortunately, with no inductance to aid smoothing, these designs aren't suitable for SETs. So, the hunt for the perfect low-noise, low-Z supply continues. :)

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