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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 27th March 2013, 02:39 PM   #5821
Salas is online now Salas  Greece
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The simplistic Salas low voltage shunt regulator
Its a juggling act since the available gate drive current reduces, so while the OLG goes up lower in freq due to more voltage drive it also starts falling earlier. That ups Zo before 100kHz and it could be associated with your preference for carbon film. All in conjunction with M2 type, Zobel, & specific active load. Also the phase margin changes so checking with oscope is essential as you mentioned. Its a tolerant topology but tweaking that far without visual test gear is not recommended to novice builders I guess.
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Old 27th March 2013, 03:03 PM   #5822
pietjers is offline pietjers  Netherlands
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Quote:
Originally Posted by Salas View Post
Its a juggling act since the available gate drive current reduces, so while the OLG goes up lower in freq due to more voltage drive it also starts falling earlier. That ups Zo before 100kHz and it could be associated with your preference for carbon film. All in conjunction with M2 type, Zobel, & specific active load. Also the phase margin changes so checking with oscope is essential as you mentioned. Its a tolerant topology but tweaking that far without visual test gear is not recommended to novice builders I guess.
Salas thank you for explaining the effects of increasing R5. I am fully aware of the risks involved, but High End audio is often trail and error, and about pushing the limits. Sonically the circuit reaches a level of performance I have not heard before.

Peter
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Old 6th April 2013, 07:41 PM   #5823
samoloko is offline samoloko  Bulgaria
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Phew, lots of drawing.
Salas
are these most up to date 1.2R
which one you recommend to power with 24 Vdc Ugs preamp
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Old 6th April 2013, 07:58 PM   #5824
Salas is online now Salas  Greece
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The simplistic Salas low voltage shunt regulator
Those were the last, yes. Two Reflektors in floating double polarity arrangement would be easier to implement for layout, are anti ground loop, also absolutely the same for semiconductors between the two polarities. Which can be many similar types. The CFP in the 1.2R can be sensitive and give pain in the making and deployment. I will show you a 24V example ASAP.
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Old 8th April 2013, 02:31 AM   #5825
Salas is online now Salas  Greece
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The simplistic Salas low voltage shunt regulator
Here you are. This can go to 35Vout safely also. Spot on Vo its all about using the proper R8. Or a 10K trimmer. Not best choice for ppm but handy. For finding the right value including current and VF tolerances in a build and then substituting with a good R8 at least. Keep 10V drop over the reg for the 9610 to be on its low capacitive.
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Old 8th April 2013, 09:43 AM   #5826
samoloko is offline samoloko  Bulgaria
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thank you very much Salas
Is this 24 V reflektor a better choice over BIB for powering UGS V3 pre

regards
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Old 8th April 2013, 01:20 PM   #5827
Salas is online now Salas  Greece
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The simplistic Salas low voltage shunt regulator
They are both adequate. It takes you combine them with a certain preamp and you choose subjectively which one combination you may prefer.
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Old 8th April 2013, 01:32 PM   #5828
samoloko is offline samoloko  Bulgaria
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which one of the BIB, reflektor, 1.2r Is more Independable from wire distance between regulator out and load (25 - 45 cm) and also which one of the three Is more oscilations free than others
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Old 8th April 2013, 01:36 PM   #5829
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The simplistic Salas low voltage shunt regulator
There are general precautions that should be the same but probably the Reflektor would be easier to work with and deploy. It has just one driver block doing it all by monitoring current dif.
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Old 8th April 2013, 02:10 PM   #5830
samoloko is offline samoloko  Bulgaria
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Salas

I see that In reflektor you have lowered zobel cap to 0.1 from 0.47
Is that a tunning mod based on listening tests - Is regulator stable that way
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