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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 9th November 2012, 10:56 AM   #5551
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
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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The simplistic Salas low voltage shunt regulator
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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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The simplistic Salas low voltage shunt regulator
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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The simplistic Salas low voltage shunt regulator
Reflektor
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Old 12th November 2012, 09:09 PM   #5555
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
... Here is your asked example. Good luck.
Attached Images
File Type: png Snap 2012-11-13 at 00.07.24.png (25.5 KB, 507 views)
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Old 12th November 2012, 09:10 PM   #5556
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The simplistic Salas low voltage shunt regulator
I was searching hard thanks
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Old 12th November 2012, 09:13 PM   #5557
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
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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The simplistic Salas low voltage shunt regulator
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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The simplistic Salas low voltage shunt regulator
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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The simplistic Salas low voltage shunt regulator
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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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