| pjpoes |
| Hey guys, I was wondering if its possible to make the Jung super regulator work at 3.3 volts. I have been talking with someone about it who said he tried and was unable to make it load stable. He thought the problem might have been that he was using 12 volts, and thought it needed a minimum of 15 volts to work right. I didn't think that was so and was wondering if any of you might know why it didn't work, and what I might need to do in order to make it work, or if its even possible. If you haven't guessed, this is to power a DAC. Any help you can offer will be greatly appreciated. |
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| mr.duck |
| I don't think it will work because the LM329 voltage reference is 6.9v so the voltage output would need to be at least that. according to this page voltage output needs to be at least 9v. |
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| mitwrong |
| quote: | Originally posted by pjpoes
Hey guys, I was wondering if its possible to make the Jung super regulator work at 3.3 volts. |
| quote: | Originally posted by mr.duck
I don't think it will work because the LM329 voltage reference is 6.9v |
Guys:
Have a try by replacing the LM329 by TL431, TL431 is a high precision voltage reference. It can also trim to the desired voltage as U want.
SUGGUSTION IS FOR YOUR REFERENCE, MAY CAUSE THE DESIGN BETTER OR WORSE :whazzat: |
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| aparatusonitus |
| You'll have to find an opamp stable at unity gain that can operate at 3V3 supply, I guess. |
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| moamps |
With the part I added to the Jung/Didden design in the schematic below, the super regulator just might work at 3.3V. Sorry Jan and Walt for butchering up your brainchild!;)
Regards,
Milan |
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| janneman |
I know that Walt has published 5V and 3.3V versions of his reg for digital circuits. IIRC he used a 2.5V precision ref. I guess you should check his website.
Jan Didden |
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| moamps |
Jan, could you please post a link to the 3.3V version? I have trouble finding it on Walt's site. Thanks.
Regards,
Milan |
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| moamps |
| Has anyone managed to dig up the 3.3V version yet? |
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| Christer |
| quote: | Originally posted by moamps
Has anyone managed to dig up the 3.3V version yet? |
Perhaps this paper with a 5 V version is the one? Although he doesn't seem to say anything about other output voltages, he says the op amp works well down to 2.7 V.
http://waltjung.org/PDFs/Low_Noise_...og_Circuits.pdf |
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| DJ Exprice |
Just run it of 2 D-cell batteries! :D
Just kidding (unless you really do think it would work)
I know that a bunch of companies make 3.3v regulators...just go look some up on Newark, Mouser, or DigiKey :D |
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| janneman |
It should work if you would increase R3 to, lessee, I guess R3 = [2.5/(3.3-2.5)]*1k. And decrease R6 to keep the same bias current into the reference.
Jan Didden |
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| moamps |
| quote: | Originally posted by janneman
It should work if you would increase R3 to, lessee, I guess R3 = [2.5/(3.3-2.5)]*1k. And decrease R6 to keep the same bias current into the reference.
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...and perhaps throw out one of the yellow diodes. The thing is way too bright anyways.:D
Regards,
Milan
P.S. God bless the edit button.;) |
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