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Old 20th June 2013, 08:40 AM   #711
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Thanks and sorry for stupid question. Should have been first place to look.
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Old 20th June 2013, 08:03 PM   #712
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THanks again. Answered all my questions. Very well written.
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Old 21st June 2013, 06:37 AM   #713
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THanks again. Answered all my questions. Very well written.
There IS a reason why I started Linear Audio

jan
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Old 29th June 2013, 10:12 AM   #714
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Default Comments to Vol 5 articles

I have received several letters commenting on articles in Linear Audio Vol 5.
Just finished putting them all on-line in the letters section.

There are comments to the articles by Hans van Maanen, Morgan Jones, Gary Galo, Bruno Putzeys and Richard Burwen. All are PDF and available for download.

jan
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Old 29th June 2013, 10:20 AM   #715
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You just broke the camels back. Too interesting to not enjoy.
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Old 29th June 2013, 05:22 PM   #716
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The ones shown in post #677 are 5-pin with both output sense and Gnd sense.
Jumper pads are provided on board to convert them to 3-pin if so wish.

I like them ~ TO220 size as they are then very handy as 78xx / 79xx replacements.


Patrick
Hello,

Not so sure at least for digital applications. 7805 and there higher voltage versions probably have superior performance in the 1mhz+ region or 1-3mhz region to the super-regs.

I am sure Walt Jung said something to this affect himself. Op amps like the AD797 etc trade H.F. loop gain at the expense of getting enormous L.F. loop gain./PSRR/Zout etc. Great for LF apps but not digital.

I doubt, due to the way the 7805, 7815, 7915 where designed, that the superreg's of any derision can actually beat them at least for digital applications on some measurements.

Best Regards

Kevin

Last edited by Fanuc; 29th June 2013 at 05:25 PM.
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Old 29th June 2013, 05:46 PM   #717
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Those 78xx and 79xx are not conceptually different then a superreg: a reference, a series device, and an error amp. Only much less in performance than a superreg. If you compare the data sheet for the 78xx, 79xx to the superreg measurements, you'll see there's really no competition.

Don't let the huge DC gain of the opamps put you on the wrong foot. Yes, the 797 gain at DC is huge, but it's gain is huge at all frequencies compared to the 78, 79 opamps.

jan
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Old 29th June 2013, 06:09 PM   #718
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Those 78xx and 79xx are not conceptually different then a superreg: a reference, a series device, and an error amp. Only much less in performance than a superreg. If you compare the data sheet for the 78xx, 79xx to the superreg measurements, you'll see there's really no competition.

Don't let the huge DC gain of the opamps put you on the wrong foot. Yes, the 797 gain at DC is huge, but it's gain is huge at all frequencies compared to the 78, 79 opamps.

jan
Hello Jan,

This was always the problem with the datasheets for the 78/79** critters- it is not spec'd in the upper Mhz region where it matters for digital.

WaltJ suggested using a LCR filter (great idea) in one of his articles for the super-reg, that could add maybe 70db of additional d.c. line rejection at 1 mhz+. Absolutely no problems with that.

But the jury is still out on whether the super-regs can beat plain-vanilla 78** or 79** type regulators for digital apps _without_ external help whether passive or active.

Kevin

PS. It is accurate measurements that matter here not talk etc.
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Old 29th June 2013, 06:14 PM   #719
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But the jury is still out on whether the super-regs can beat plain-vanilla 78** or 79** type regulators for digital apps _without_ external help whether passive or active.

Kevin
So, show me measurements that show the 7805 as good as Walts' 5V version.

You said 'the way the 78xx is designed' - apparently not realising they are conceptually the same as a superreg.
A reference, an error amp receiving both the ref and a sample of Vout, driving a series pass element.
Of course, the superreg is using optimized and high-quality parts in all places, and that poor 78xx can't, so it is no shame for it to be rather limited in line rejection, noise, Zout, load rejection, what have you.

jan
Attached Images
File Type: jpg 78 structure.jpg (49.5 KB, 415 views)
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Old 29th June 2013, 06:37 PM   #720
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I would love to see it as well. So simple. Who would not choose it.
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