Choke power supply- part 2

@daveyf ,

The first question would be do you know what a choke power supply is?

More accurately would be a choke filtered power supply, with a few different variants.

Why not?  Other than the cost and bulk, there is the question of whether they are the best implementation.

That said, most linear power supplies have some choke filtering, just for high frequencies.

Output of a bridge rectifier is DC + harmonics of twice the AC frequency. The choke in combination with the capacitor forms filter eliminating some of those harmonics, but the choke in combination with the load does as well. Hence, the output voltage can droop. So much for your high dollar, low resistance AC power cord.

To get enough inductance to be useful, you need a large inductance which means materials that are not great at high frequency. So at that point, do I really want the big inductor, or should I go for s smaller inductor and burn off a bit of power with a linear regulator? The best answer is always trade off the properties for the best overall implementation.

@cindyment  I hope you understand a linear power supply is to create a DC voltage and current out of a 60 hz AC line. One would not want it to pass high frequencies. The OP is posting about a choke input PS, which is considered to be a step above an ordinary supply using chokes and caps after rectification.

Whether you put the choke on the input or the output the effect is the same. A transformer reflects the impedance from one side to the other based on the turns ratio. Even if the inductor is on the front AC side, it still effectively forms an LC with the capacitor. Note Schiit's Description. It works, but is it is a good engineering idea? Questionable.  The "custom nickel core" sounds all impressive, but that is just common core material and custom inductor is not remotely difficult.

And pure LC—inductor-capacitor filtering from the highest to the lowest band, including 4 custom 80% nickel-core inductors as big as 1.5 Henries. 

Well apparently Schiit figured out a way to make it a "good engineering idea" without checking with cindyment.  Mike Moffat and Jason Stoddard have been designing/engineering amplifiers and dacs since the '90's, so they might know a thing or two about it.

And Pass amps use choke filters in their supplies too, but the question was why they are not more common, not whether they "can" work. I don’t need Mike Moffat and Jason Stoddard’s blessing for my comment and I expect across a table with engineers, their answer would not be much different from mine.

The fact it "impresses" you means it already "works", even if it does not make sense. It sounds really cool from a marketing standpoint. Choke regulation used to be common in linear power supplies.