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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 21st December 2011, 03:33 PM   #4691
AndrewT is offline AndrewT  Scotland
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Salas presented a "SHUNT" regulator.
He does not show a series regulator as part of the regulation operation.
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Old 24th December 2011, 04:43 PM   #4692
tim845 is offline tim845  Hong Kong
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Quote:
Originally Posted by AndrewT View Post
Salas presented a "SHUNT" regulator.
He does not show a series regulator as part of the regulation operation.
Thanks Andrew.
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Old 24th December 2011, 05:07 PM   #4693
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
Hi Salas
I asked: What do I need to do to get the Reflektor output to 37V?

Your answer:
Quote:
Originally Posted by Salas View Post
With your 560s and 37V I don't see a problem for Q3 Vceo or dissipation so don't change something. Just use 10K trimmer for R5. Watch Vin max not to kill J1. J1 will see ~ Vin-5V.
I guess you mean R7 in the following circuit correct ?
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File Type: gif Reflektor+24V.gif (12.9 KB, 938 views)
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Old 24th December 2011, 06:34 PM   #4694
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Yes.
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Old 24th December 2011, 09:48 PM   #4695
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
Super cool.... I will work with those for my new project.



Merry christmas
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Old 1st January 2012, 10:49 PM   #4696
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
I finished the reflektor mods and am now listening to those powering my Benz 28V 48dB riaa.... Not bad at all. Splendid highs, good presence. I am amazed.

My first impressions where not that good so I decided to increase CCS current to 300mA and now it is singing.

I will keep listening and let you know my impressions after a while.
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Old 2nd January 2012, 11:55 AM   #4697
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by RCruz View Post
I finished the reflektor mods and am now listening to those powering my Benz 28V 48dB riaa.... Not bad at all. Splendid highs, good presence. I am amazed.

My first impressions where not that good so I decided to increase CCS current to 300mA and now it is singing.

I will keep listening and let you know my impressions after a while.
Happy New Year Ricardo, just curious all Salas shunt regs sounds good with more current

P.S. Pics will welcome.
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Old 2nd January 2012, 08:22 PM   #4698
klewis is offline klewis  United States
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Default Reflektor

Happy New Year Salas,

A question for you on the Reflektor; I found the Analog Devices Dual matching PNP transistor - SSM2220, low noise, hfe matched to 0.5%, specs seem similar to the 2n4403. Would these be a good choice for your Reflektor?

Ken
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Old 2nd January 2012, 08:46 PM   #4699
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Yes. Maybe overkill but excellent. Watch Vceo and Q3 Pmax in your app.
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Old 2nd January 2012, 09:29 PM   #4700
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
After severall hours listening I find the reflektor a very very good performer.

It presents enhanced detail in the bass, maintaining very good presence. Highs are cristal clear and the reg is ultra low noise.

The voltage raises very slowly until it reaches the designed value so I advise a warm up period of 10 to 15 minutes before serious listening.

On Vref I am now using 2000u and 1u at the output zobel.

Raising ccs current from 200 to 300mA was a big revelation.

Salas... congratulations on this inexpensive, super stable and effective design.

PS:
These are old pics.... nowthere are only two 1000u on Vref and a 1u at the output
Attached Images
File Type: jpg DSC_1154 web big.jpg (210.6 KB, 772 views)
File Type: jpg DSC_1155 web big.jpg (197.7 KB, 696 views)
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Last edited by RCruz; 2nd January 2012 at 09:35 PM.
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