Every time I simulate it, it oscillates. I'd like to see a Bode plot from 10Hz to 10MHz. Consider some R between the collector of Q6 and ground (this has been mentioned before.)
With respect to PA's comment -- the faster the opamp, the lower the output impedance of the circuit.
..Though there's no use using a faster/slicker/more-fashionable opamp if you cannot stabilise the whole and keep it that way into the real-world load it drives (over the full range of expected load currents)...
Agreed, we found that the AD825 sounded really nice in the "Improved" Jung regulator. Most of the time I've used the AD797AN in the "Original" (1995) regulator without problems, but sometimes it can get finicky. LME49710 sounded well and tested well.
Hi Guys just read the article in linear audio about the different regulators.
Is there any way to get my hands on a PCB for the Jung/Didden regulator or evt. the Sjöstrom regulator. Preferably the first one. I'm looking for a +/- PSU of my audio path opamps. I was aming at the best avail. Any tip or link would be much appriciated.
TIA,
Peter.
Is there any way to get my hands on a PCB for the Jung/Didden regulator or evt. the Sjöstrom regulator. Preferably the first one. I'm looking for a +/- PSU of my audio path opamps. I was aming at the best avail. Any tip or link would be much appriciated.
TIA,
Peter.
The old colony boards are no longer available. Per Anders has a website -- and designed the Sjostrom boards.
Superreg boards
I finally bit the bullet and layed out a set of superreg boards based on the original 1995 series articles, updated after Walt's 4/2000 article.
These are the successor boards to the ones Jack showed here.
All info is here: The Superregs
Let me know if there's anything I missed or got wrong.
jan
I finally bit the bullet and layed out a set of superreg boards based on the original 1995 series articles, updated after Walt's 4/2000 article.
These are the successor boards to the ones Jack showed here.
All info is here: The Superregs
Let me know if there's anything I missed or got wrong.
jan
Looks nice, thanks for the files.
Just wondering if you could split the pos and neg boards? Most of the time I only need the pos one, would be great to have separate boards so that we could just choose what we need.
Just wondering if you could split the pos and neg boards? Most of the time I only need the pos one, would be great to have separate boards so that we could just choose what we need.
Looks fantastic - many thanks Jan!
I hope they are available somewhere before too long - or even kits. I could use a few of these.
It would not be hard to score the boards between the two halves and just snap off a single reg - similar to how some of the salas reg boards are distributed.
bk
I hope they are available somewhere before too long - or even kits. I could use a few of these.
It would not be hard to score the boards between the two halves and just snap off a single reg - similar to how some of the salas reg boards are distributed.
bk
One nice thing which PA did with his boards is provide for an SMT error amplifier -- if you rotate the chip 90 degrees you can put in pads for an AD825AR. Thus you can use both SMT and through-hole. The two 1K resistors in the output sense/divider should be provisioned for 1/2 watt.
Jack, could you provide a bit more info on this? I built the SSR01 as provided in the instructions, but did not see anything (or missed it) regarding this option.
You have it in the schematics and in the complete BOM. The transistors have SOT23/TO92 footprints. See Q5 in the picture.
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I find gold plated boards to be somewhat difficult to work with -- i've probably fixed more F4's and F5's for folks with issues that surfaced after the device was installed. Tin-plate is much easier to deal with.
Jack, I saw that you tested the SSR01 with the LT1028 and it had a lower noise figure. Are there any risks using the LT1028? IYO does it sound as good as the AD825?
I've just finished the SSR1 & SSR2 with LM329 & LT1028, just running fine and having an auditable difference to the one I had. Well, it's almost no comparison against the 7815 & 7915. Based upon the review in Linear Audio. No measurements but sound stage improved & klinical sound (almost aggressive highs) is gone .... I think ....