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Old 30th September 2009, 03:21 PM   #31
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Quote:
Originally Posted by peranders View Post
Jack, when I see your grounding scheme, how did you think? You have made a dual PS with two separate ground connections? Grounding is critical you know.
National also recommends bypassing the LME49600.

I can put in a modified ground scheme with copper tape.
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Old 1st October 2009, 02:41 PM   #32
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Jack, why do you feed the opamp from the unregulated side? You have missed decoupling of the LME chip plus rather long small trace. For a Super Regulator compactness is a virtue, don't you agree Mr. Didden?
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Old 1st October 2009, 03:19 PM   #33
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Originally Posted by peranders View Post
Jack, why do you feed the opamp from the unregulated side? You have missed decoupling of the LME chip plus rather long small trace. For a Super Regulator compactness is a virtue, don't you agree Mr. Didden?
Unlike the Super-Reg -- I don't see how this one starts if you attempt to feed it from the regulated side. In the Super Reg there is current flowing to start it going.
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Old 1st October 2009, 05:00 PM   #34
AndrewT is online now AndrewT  Scotland
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Originally Posted by jackinnj View Post
Unlike the Super-Reg -- I don't see how this one starts ............. the Super Reg........ current flowing to start it going.
there is a whole section on start up.
It's inherent in the design.

You too must design for self starting.

There are others that cannot do this and then he/she organised a Group Buy with a non reliable starting and oscillating regulator.
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Old 1st October 2009, 05:13 PM   #35
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Originally Posted by AndrewT View Post
There are others that cannot do this and then he/she organised a Group Buy with a non reliable starting and oscillating regulator.
It always amazes me how things happen sometimes in the real world. There are huge GB started on projects that aren't anywhere near stability/completeness, and then there are well tested and performing circuits and nobody's going for those. Puzzling.
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Old 6th October 2009, 05:13 PM   #36
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Well, forget about the LME49600 Regulator -- here are some results --

A Weighted level measurements -- a.c. coupled with 15mA load -- shielded by my Oreo Cookie Tin:

78L15 (ST Micro) RMS 26.9uV, Quasi-Peak 44.3uV
LM317 (National, No adj bypass) RMS 181uV, Q-Peak 289uV
Super-Regulator (LT1028 error amp) RMS 2.2uV, Q-Peak 3.6uV

LME49600 (LM4040 Ref) RMS 347uV, Q-Peak 564uV

My advice to you, young man, get the Super-Reg boards from Old Colony and stop wasting your time.

The Super Reg is only slightly noisier than the battery.
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Old 6th October 2009, 05:19 PM   #37
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Good info, much appreciated! Jack, I'm not sure I understand correctly the setup. The load was a sine with 15mA amplitude and no DC component, for all of the regs you mentioned?

(Was it me wasting my time? )
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Old 6th October 2009, 05:49 PM   #38
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I used an RN55 1k resistor for a 15mA DC load -- this was coupled via a 1,000uF capacitor to the AP Analyzer (with a 10k RN55 to discharge the business end.)
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Old 6th October 2009, 06:10 PM   #39
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Quote:
Originally Posted by underwurlde View Post
Yes, I have searched this forum & have spent many hours wading through all of the great info herein.

But therein lies my problem & hence the (all be it) leading question: There is just SO much information.

So, yes, I did eventually end up at Andy Weake's excellent website, and stepped through his progressivly better SuperReg pages...

... only to get right to the end ...

... to the best design ...

... and bosh! Missing diagrams!

Arrrggh. I guess he may have taken this final design off as he now sells them commercially?

Any 'up to date' pointers would therefore be much appreciated.

Andy
The documention can be found if you click at the links Have you checked Walt Jung's webpage. All you have to know is there.
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Old 6th October 2009, 06:57 PM   #40
iko is offline iko  Canada
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Originally Posted by jackinnj View Post
I used an RN55 1k resistor for a 15mA DC load -- this was coupled via a 1,000uF capacitor to the AP Analyzer (with a 10k RN55 to discharge the business end.)
Oh, then unless you used the same reference device for each of them I'm afraid we're comparing apples with oranges. No?
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