The simplistic Salas low voltage shunt regulator - Page 556 - diyAudio
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Old 9th November 2012, 10:56 AM   #5551
Salas is offline Salas  Greece
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Quote:
Originally Posted by dahlberg View Post
I wonder if it's possible to use the salas regulator as a filament dc supply.
What's available is 7.5v ac and that is supposed to end up as
4,75-5,25v dc @1,8A.
Is this possible and how much ac ripple is there to be expected at the output ?

It has been done for heaters using a basic V1 special with low Vbe power BJT output by member disco for a #26 preamp down to 1.5V.
You would need a heavy PMOSFET in the CCS basically, and the lower impedance MOSFET output versions are still OK for your circa 5V. Don't ask for sure ripple numbers, we haven't used a config as you describe before. You may try a Reflektor with IRF9640 at CCS and STP55NF06L at output. ICCS=Vbe/R1. Set 2A+. Watch CCS MOSFET's dissipation, it will be around 10W.
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Old 9th November 2012, 11:01 AM   #5552
Salas is offline Salas  Greece
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Quote:
Originally Posted by samoloko View Post
what Is and what for reflector Is used
Its a regulator mixing shunt current sinking and current mirror control principles. Its used for powering various circuits with rather nice subjective results.
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Old 12th November 2012, 08:42 PM   #5553
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hi, if I want to build the +30V shunt reg on proto matrix board, and not the most complicated one, which version would you recommend ?
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Old 12th November 2012, 08:55 PM   #5554
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Reflektor
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Old 12th November 2012, 09:09 PM   #5555
Salas is offline Salas  Greece
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... Here is your asked example. Good luck.
Attached Images
File Type: png Snap 2012-11-13 at 00.07.24.png (25.5 KB, 427 views)
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Old 12th November 2012, 09:10 PM   #5556
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I was searching hard thanks
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Old 12th November 2012, 09:13 PM   #5557
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You would not find it exactly, I just set it for you. Use 1W R1. M2 is an easy to get Fairchild, but you can use ST Micro STP55NF06 too. Analogous.
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Old 12th November 2012, 09:17 PM   #5558
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P.S. you can trim R6 with adding some little more value to it for 30V sharp if it ends up less than target, depends on your semis bias. Better than a trimmer.
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Old 12th November 2012, 10:07 PM   #5559
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thanks chief
what a monster, driving a wimpy SMD j310
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Old 13th November 2012, 07:08 PM   #5560
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Quote:
Originally Posted by Salas View Post
... Here is your asked example. Good luck.
schematic says +40Vdc input, which is fine
but is there any 'slack' on that, plus minus a few volt maybe, or any specific limits ?
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