Super Regulator, collecting the facts

[peranders]

Hi!

I wonder about a few things regarding the Jung Super Regulator:

How fast does it start with the original component values?

Does it work for negative voltage using AD797, assuming all signs have been changed, NPN->PNP and vice versa?

What happens when you have current limiting and the voltage is below min voltage for the opamp?

[PMA]

Per,

could you kindly link to the schematics?

Thanks,
Pavel

[peranders]

http://www.e-insite.net/ednmag/archi...97/01di_03.htm

[dimitri]

After building super regulator we connect it to several opamp via RC filters to prevent possible loops. The individual supply to each opamp will have source resistance R in parallel with C, now C value and it type again become significant. How should one choose R and C values? Should R be replaced by inductor? I feel that using super regulator for each opamp is too much.

[peranders]

jwb, you have a point here and I don't mind also good info collectors.

dimitri, I would have chosen 10-100 ohms + 47-470 uF// 100nF/63 polyster/ceramic. This I think is a good compromise for some isolation between the opamps. This is also good thinking.

Use 100 ohms to start with. Lower the value if you feel that you get to much voltage drops. Less than 10 ohms the isolation effect become rather small.

[dimitri]

Peranders, as we use 10-100 ohms + 47-470 uF// 100nF (corner frequency 3-300Hz) why we need super regulator with milliohms in wide frequency range? We will lose the most of it strength.

[johnferrier]

Peranders,

Isn't the SuperRegulator idea incorporated into currently available low noise, low dropout regulators??? For example the LT1963 1.5 A regulator has less than 40uV noise (and the LT1763 0.5A regulator <20uV noise). A good voltage reference such as a REF02 has a typical noise of 4uV to start with.

LT1963 Datasheet:
http://www.linear.com/prod/datasheet.html?datasheet=886

Here is the TI datasheet: http://focus.ti.com/lit/ds/symlink/tps78601.pdf

Here is a good LT app note: http://www.linear.com/pdf/an83f.pdf

I've wondered about why people aren't using/talking about these.

(To be frank, my interest is to build a headphone amplifier so 1.5A is more than enough. For higher current capability, can't the LT1963 be used with a power FET?)

Comments anyone?


JF

[randytsuch]

Hi Guys,
I just bought a pair of kits from Andy, he sent them out this weekend, but they have to go from England to LA, so not sure when I will get them.

I plan to use them in a simple FET preamp, to generate the +/15VDC I need.

The original design called out for 3 term regulators, but I wanted to upgrade .

I will let you guys know how it turns out, but as with all my projects, I am sure this one will take a while to complete.

Randy

[jwb]

Jung (and Sulzer, and other error-amp-with-pass-transistor designs) have extremely low output impedance and very wide bandwidth. The output impedance is much lower than three-terminal jobs like LT1962. That's why my headphone amp, with idle current only a few hundred milliamps, uses four Sulzer-type regulators instead of the commercial parts. The distortion reduction is significant.

What actually sold me on the Sulzer regulator was its amazing ability to regulate the load. Stepping from 0 to 1A output barely perturbs the voltage level. I was truly impressed.

Also three-terminal regulators tend to use noisier voltage references. In a superregulator you can use subsurface zeners or other high-quality refs.

[peranders]

You have many good integrated regulators but this thread was about the Jung regulator in particular. The examples which you have mentioned is way over the 78xx/79xx but in some application nothing (at the moment!) beats a discrete regulator.