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Old 5th June 2012, 02:48 PM   #711
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The "pre-regulator" described in the follow up article Improved Positive/Negative Regulators Audio Electronics 4/00 will limit the current. The pre-regulator will raise the output impedance a bit, however.

http://waltjung.org/PDFs/Improved_PN_Regs.pdf

Last edited by jackinnj; 5th June 2012 at 02:52 PM.
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Old 6th June 2012, 10:14 AM   #712
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Per, since you turned PMs off, could you send me a PM or email?
I need to ask you something about psu and the bridge PCBs i already have.
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Old 25th June 2012, 07:44 AM   #713
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Hi,

Has anyone tried configuring an LM723 as a super-reg ? Any reason why it wouldn't work ?

Cheers

Tom
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Old 25th June 2012, 08:46 AM   #714
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No basic reason why it wouldn't work - it has all the necessary elements like reference and error amp.
However, from the specs like error amp BW and noise etc, the performance will most likely not be on a par with a superreg with carefully selected (active) devices.

jan didden
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Old 25th June 2012, 08:59 AM   #715
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Thanks - the vref is 7.25V so I guess that'd suit 12v or higher supplies, and I could use an lm329 on the op amp output for that, or drop the voltage from the vref with the datasheet's suggested potential divider. I shall give it a try... it should work slightly better than the standard 723.

Tom

Last edited by KlipschKid; 25th June 2012 at 09:03 AM.
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Old 25th June 2012, 07:50 PM   #716
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Quote:
Originally Posted by KlipschKid View Post
Hi,

Has anyone tried configuring an LM723 as a super-reg ? Any reason why it wouldn't work ?

Cheers

Tom
I'm not sure it would work without some additional hardware. The thing that differentiates the more advanced "super regs" is that the op amp + pass device actually regulates the output, and the op amp is fed directly from that output. I don't recall ever seeing a 723 circuit that does that.

I'm sure it could be done with added parts, however.

Walt Jung
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Old 26th June 2012, 08:33 AM   #717
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Hi,

I'm quite happy to add a few parts. The vref is a buried zener and the noise is filtered with a low pass filter. Large caps (say over 5uF) in this filter cause the output to stay at vref, 7.25V, at start up, before dropping to the set output voltage. This would seem to lend itself to the super-regs start up conditions.

Anyway, I'll give it a try next week just out of curiosity.
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Old 15th November 2012, 12:41 PM   #718
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is the alwrs pcb still available anywhere?
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Old 15th November 2012, 12:50 PM   #719
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ALWSR boards? Yes, contact http://www.at-tunes.co.uk/
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Old 15th November 2012, 12:53 PM   #720
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thanks.
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