Super Regulator, collecting the facts

[peranders]

I'll guess we know the truth when we can see one. I'm not sure either which regulator type is the best in terms of regulation properties.

I have just downloaded the article but when you read such an old document you must be extra careful if some of the facts are based on available parts. This means that some of the content may be false today but was true back then.

[Onvinyl]

Hi,
here is a conceptual sketch of my idea. If there is some interest in discussing it, it might be best to split this into a new thread, if not, its a footnote...
Please note that my circuit is not the ALW circuit, but the 2002 jung-didden circuit.
Is my thinking correct, that we need an additional 'beta-booster'?
thanks,
Rüdiger

@Per-Anders: I tried a simple one-fet amp with LTSpice, but even don't get the DC-operating points, let alone square wave response or the like...

[peranders]

You must also have a DC source. Right know I don't remember if you can get AC+DC from the voltage source or if you have to fix it with some addition.

Please do start a new thread.

[Onvinyl]

Originally posted by peranders

Please do start a new thread.

I did.
Rüdiger

[Onvinyl]

Hi,
i use the attached board. It is very similar to alw's version, but it does not have the extra driving transistor for the pass device, T2.
I had a ztx450, so I added this transistor in the place of R5 (10R) and changed R3 from 249R to 100R.
It is the almost the same circuit now. but it does not work, I get 6Volts out instead of 15V.
What happens there?
Rüdiger

[Onvinyl]

Hi,
despite from my non-solved problem above,
I wonder about the optimal opamp-decoupling in connection with the super reg: Since it is said, don't use large uF after the superreg, will decoupling caps on the opamp pins need to be smaller than normal (say, smaller than 100uF)?

Rüdiger

[peranders]

aos' boards are cheap and no support is included what so ever (this is clearly stated but not very good when support is needed )

Have you checked the pinning of the small signal transistor?

American types are E-B-C, european model C-B-E

About decoupling, yes not too much. 100 uF or so is a good start and if you want more for some reason you might verify this with measurements. An oscilloscope is necessary.

The idea behind the regulator is to create in an artificial way low output impedance and the chance for this is good since the board can handle AD825.

[jackinnj]

Originally posted by peranders

Anything to show?

hard to believe that this thread has gone dormant -- my super regulators with through-hole devices work just fine but the version i built with surface mount components (substituting MJD44H11 and MMBT5087, smt leds, zeners and clamp diodes etc.,) suffers from the "false-start" syndrome -- the footprint is 3.5 x 2.5 inches for one board with positive and negative regulators.

[peranders]

What is false start? Do you mean you'll get a hang-up at a voltage lower than expected?

[jackinnj]

yes, the output voltage is 2.19V, just as Mark Kovach had written in Audio Electronics -- i suspect I made a mistake somewhere -- for the through-hole devices I get +/- 13.775V.