Better psu than sigma 11? - Page 2

what is the published performance of the gold reference?

 

 

The minigold/Golden Reference is a pass regulator(see below), so it will be able (by design) to handle a bit more current than a shunt regulator like the Jung or others. I do not understand how a sense circuit could provide an appreciable improvement in performance that would be noticable, especially if the power supply in question is placed reasonably close to the circuit for which it is powering.

 

These are the same regulator, and are kissing cousins to the Sigma, using an opamp as a comparator instead of a discrete differential. The bipolar supplies do not appear to have one rail tracking another, which is not important to the OP since he/she is interested in comparisons to the Sigma11. It is unclear to me if these would have the "soft start" feature of the Sigma. Both designs use a current fed zener for reference.

Edited by digger945 - 12/13/10 at 5:54pm

To the OP: adding a high quality PS to the emu 0404 is a bit of waste as it has internal, noisy, DC to DC converters to power the various ICs. See :

- http://www.diyaudio.com/wiki/E-MU_0404_USB_mod_wiki

- http://www.diyaudio.com/forums/digital-line-level/113370-e-mu-0404-usb-modification-5.html
 

 

The Jung super-regulator is not a shunt regulator. It is a serie regulator. Actually, the minigold is very close to the Jung super-reg (more so than to the sigma: error amplifier fed from the output, ccs to feed the base of the pass transistor). The only real difference is the addition of a transistor at the output of the opamp acting as error amplifier, so that it can manage a higher base current for the pass transistor.

 

Think of the minigold as a Jung on steroids, without the usual lm317 floating prereg.

 

 

edit: while I'm at it... at first sight, the minigold shouldn't perform in the same league as the proper Jung super-reg. The Jung isn't only a topology, it's also a careful parts selection and proper PCB design. Inferior voltage references, opamps and pass transistors probably won't allow the minigold to be as technically perfect as the Jung. It probably doesn't matter in 99% of the usual audio uses.

 

Edited by 00940 - 12/12/10 at 4:39pm

If you take a look a Jung's website he has a publication that shows a regulator very similar to the Gold Mini (bootstrap CCS with the error amp fed by the regulated voltage). The article is from 1995 if I remember correctly. He also has an improved version of it in a later publication.

The Jung super regs can do more current if you put more into CCS. Not that big of a deal

Some of you might be interested in this thread about shunt PSUs, in particular my responses.

My bad. I was thinking of the Jung shunt from 1974, and lots of reading on Tangent's website about the shunt.

 

 Looks like the improved version is the Jung 2000.

 

Walt Jung is a prolific writer... usually though, the "Jung regulator" without further qualification is often identified with the serie regulator published in 2000 (at least on diyaudio and some other diy websites I usually frequent).

 

You have a link for the 1974 shunt ? All I can find on his website or on the web is the 1969 article.

Please forgive me once more. You are correct sir, in that the article about the shunt regulator is indeed the 1969 article.

 

And the link to the 1974.

 

Jung's regulator library. (you have it from there )

 

Of course, the link started at Tangent's website. Lots of reading there. I have the Tangent YJPS v1.1 pcb, just need some time to put it together.

 

I still maintain that there are more similarities to all of these pass regulators mentioned, although I will agree that implementation is king in how the machine works. They all use something to compare the output to some reference, and then control the pass device through yet another VAS or buffer device.

Edited by digger945 - 12/13/10 at 4:54pm

I'm surprised that no-one has mentioned the Per Anders Sjöström 's's's   SSR01 regulator yet. He is a regular on diyAudio, sometimes called Pers or just PA. Scroll down to the bottom of the link and click "next" for the schematics. It is modeled from a tube regulator circa 1961. He also has some headphone amp designs as well as different flavors of his regulators. His stuff is pretty well tested and documented by others on diyA. Maybe worth considering as a possible alternative.

Edited by digger945 - 12/13/10 at 5:57pm

I didnt mention his regulators even though I have and use several of them quite happily (I have SSR01/02, JSR01, JSR06 and even a dual DIFF build of his QRV08 headamps), because although excellent, neither the output voltage or current capability is comparable to the S11.

 

also, the minigold, as with any of these pretty much, you do not have to use a zener, you can use buried zener, LED etc just modify pinout. zeners are just in this case perhaps a bit more appropriate given the lack of realestate and the shear amount of gain you would need to pump an LED or buried zener Vref up to 90v

 

glad I didnt need to point out the lack of a shunt on the jung reg, and I only mentioned the lack of a sense connection (although possible to work on in with a razor really) in passing as a matter of comparison, not as a feature the OP specifiucaly needs. I have actually found sense connections if well implimented to work quite well even in situations where there is not much lead length. PA himself disagrees with this somewhat WRT his own version, but my subjective results at least it has proven effective

Edited by qusp - 12/14/10 at 9:30pm

 

I'll recommend it if you have only one load. It's not so pratical if you have one power supply and many loads.

 

Sigma 11 BTW is a piece of good engineering although much slower than the super reguators.