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Old 7th December 2012, 04:10 PM   #731
Electrons are yellow and more is better!
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Any values to compare with?
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Old 9th December 2012, 04:40 PM   #732
WaltJ is offline WaltJ  United States
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Default DN2540 current source (not pre-regulator)

Quote:
Originally Posted by jackinnj View Post
ALWSR -- you should probably consider using the depletion MOSFET pre-regulator which WJ shows on his blog -- lower Zout than the Weekes version.
Not sure just what you mean here, Jack. The DN2540 cascode circuit referenced in the AX interview is operated as a current source, not a pre-reg as are featured in the vintage 2000 series type voltage regulators. The use of a current source feed (see 2009 article) is appropriate for use in a shunt regulator, i.e., the context of the interview discussion, and Fig. 1.

Hope this helps to clarify things.
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Old 10th December 2012, 02:39 PM   #733
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I should've said DN2540 pre-regulated regulator.
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Old 19th December 2012, 09:59 AM   #734
Jenyok is offline Jenyok  Russian Federation
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This is Russian answer to Jung super regulator, see circuit.
.
Output voltage is +15 Volts (positive).
Limit current is about 900mA - 1A .
.
Negative polarity, please, change transistors as follows.
NPN to PNP D44H11 to D45H11, 2N3904 to 2N3906
PNP to NPN D45H11 to D44H11, 2N3906 to 2N3904
Change diods to other polarity on circut.
Negative suply of OpAmp to output line of negative reg.
.
You may add LM317 (LM337) in input line as preregulator to this reg.
.
Prototype of this reg is circuit picture two.
Attached Images
File Type: jpg PowerSuply4.jpg (619.8 KB, 492 views)
File Type: jpg sxema2.jpg (295.6 KB, 482 views)

Last edited by Jenyok; 19th December 2012 at 10:13 AM.
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Old 19th December 2012, 03:55 PM   #735
Jenyok is offline Jenyok  Russian Federation
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Our circuit works better then Jung super reg !
Try it and compare...
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Old 19th December 2012, 05:00 PM   #736
Electrons are yellow and more is better!
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The circuit is slower than the Jung circuit, AD825 vs. Ne5532. What is better?
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Old 19th December 2012, 06:19 PM   #737
Jenyok is offline Jenyok  Russian Federation
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In simulator LTSpice IV OpAmp NE5532 works better than OpAmp AD825.
.
One more circuit.
Output voltage +15 Volts (positive).
Max current about 1A .
Attached Images
File Type: jpg power4.jpg (508.0 KB, 451 views)

Last edited by Jenyok; 19th December 2012 at 06:22 PM.
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Old 19th December 2012, 06:59 PM   #738
Electrons are yellow and more is better!
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Does work better in real life also and in what way?
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Old 19th December 2012, 07:01 PM   #739
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Quote:
Originally Posted by Jenyok View Post
In simulator LTSpice IV OpAmp NE5532 works better than OpAmp AD825.
Jenyok, what do you mean by 'works better'?

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Old 21st December 2012, 02:08 PM   #740
Jenyok is offline Jenyok  Russian Federation
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We did this reg in two hard copy.
.
I mean better... So...
For example, simulate our Russian circuit and Jung super reg circuit in LTSpice or other simulate program and see result of simulation.
And...
You will see, that our Russian circut is more better then Jung reg circuit.
In our Russian circuit is smaller instability of voltage output under loading output.
In our Russian circuit pulsation of voltage output is smaller than in Jung reg circuit.
In our Russian circuit coefficient stabilizing of output voltage is more than 70000 (> 100dB), in Jung reg circuit coefficient stabilizing of output voltage is less than 70000 .
And so on...

Last edited by Jenyok; 21st December 2012 at 02:31 PM.
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