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Old 30th September 2017, 04:18 PM   #1451
Mark Johnson is offline Mark Johnson  United States
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Super Regulator
For those who seek a foolproof circuit that guarantees every possible Super Regulator with every possible choice of opamp, will start up correctly, 100.00% of the time, ...

... but who are horrified and nauseated by post #1146 which uses (gasp!!) a voltage regulator IC to start up a discrete voltage regulator, ...

then I offer the modification below. Parts count has exploded: there are now four components. A new resistor has been added. The blasphemous voltage regulator IC has been excised, and replaced with a theologically approved Darlington transitor. A discrete transistor. Ahhh, that's better.

Q1 and D1 should be rated for a continuous output current equal to, or greater than, the maximum load the Super Regulator might drive. Even though they are only active in the first few hundred milliseconds of startup behavior, it's better to be safe than sorry. I wouldn't go so far as to mount Q1 on a heatsink, however. There's overkill and there's ridiculous, indefensible overkill.

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Old 9th October 2017, 03:58 AM   #1452
kamis is offline kamis  Serbia
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I wish to use Super Regulators in Paradise phono stage I am built at the moment instead of proposed shunt regulators. It got better results in LA listening test article. I have the following op-amps: AD825,OPA134,OP604. NE5534, LME49710. Which one to use in this MC phono stage?
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Old 9th October 2017, 12:32 PM   #1453
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by kamis View Post
I wish to use Super Regulators in Paradise phono stage I am built at the moment instead of proposed shunt regulators. It got better results in LA listening test article. I have the following op-amps: AD825,OPA134,OP604. NE5534, LME49710. Which one to use in this MC phono stage?
It doesn't really make a difference for the regulator whether to drive a phono stage or another small-signal circuit.
All the opamps you mention are suitable. My personal favorite is the AD825, never had any issues with start-up, always rock-stable. But it's a bit subjective, I admit.

Jan
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Old 9th October 2017, 12:50 PM   #1454
kamis is offline kamis  Serbia
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Thank you, I will use AD825 , Walt Jung prefers it too.
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Old 12th October 2017, 12:01 PM   #1455
couguarek is offline couguarek  Poland
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How much additional current is taken by the regulator circuit ? In some cases it's important thing.
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Old 12th October 2017, 02:56 PM   #1456
Mark Johnson is offline Mark Johnson  United States
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How much additional current is taken by the regulator circuit ? In some cases it's important thing.
If you post your calculations, I will double check them for you.
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Old 12th October 2017, 03:59 PM   #1457
couguarek is offline couguarek  Poland
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+/- 40V @ 70mA each rail
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Old 12th October 2017, 06:10 PM   #1458
peranders is offline peranders  Sweden
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Quote:
Originally Posted by couguarek View Post
How much additional current is taken by the regulator circuit ? In some cases it's important thing.
The main contributors are the supply current from the opamp (found in datasheet), current through the voltage reference and through the feedback network.

AD825 typ. 6.5 mA
Reference 1-5 mA depending of design
Feedback 1-10 mA depending of output voltage and design
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Old 12th October 2017, 06:12 PM   #1459
jan.didden is offline jan.didden  Europe
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Originally Posted by couguarek View Post
+/- 40V @ 70mA each rail
Which opamp do you plan to use?

Jan
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Old 12th October 2017, 06:32 PM   #1460
couguarek is offline couguarek  Poland
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Which opamp do you plan to use?

Jan
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