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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 28th September 2012, 09:51 AM   #5381
AndrewT is offline AndrewT  Scotland
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rCRC is better than C.
Better in this case means more attenuation of the unwanted mains and it's harmonics and all the HF garbage that comes in with the mains.

If I use thick short cable that results in 2mill-ohms of flow and return total circuit resistance for one connection pair and instead I use a slightly longer twisted pair of thin guage and have maybe 15milli-ohms of circiut resistance than I have gained a free 13milli-ohms and I have gained again with low loop area.
Now repeat that before the rectifier, after the rectifier, before the amplifier. I could get an additional 30milli-ohms of "free" resistance to make up that r of the rCRC filtering.

Every time a little capacitance follows an r or R we have a filter. All those filters add up to massive attenuation of the HF arriving at the amplifier power rails.

BTW, I posted transformer test results showing secondary resistance of 90milli-ohms in the reservoir size Thread. an extra 30 is significant.
Roender's 300 is even more effective.
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Last edited by AndrewT; 28th September 2012 at 09:54 AM.
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Old 28th September 2012, 10:17 AM   #5382
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
Thank you... can you post a link of the reservoir size thread ?
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Old 28th September 2012, 12:26 PM   #5383
Dr.H is offline Dr.H
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Why the use of double diodes in the bridge?
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Old 28th September 2012, 12:43 PM   #5384
hochopeper is offline hochopeper  Australia
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Quote:
Originally Posted by Dr.H View Post
Why the use of double diodes in the bridge?
On the PCB design there is position for MUR120 diodes or MUR8x0 diodes. Use one or the other, depends on designed load current.
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Old 28th September 2012, 12:53 PM   #5385
Dr.H is offline Dr.H
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Thx.
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Old 28th September 2012, 01:02 PM   #5386
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by roender View Post
Well, If your shunt is designed for 3.3A then yes, the resistor should have 0.3ohm. The voltage dropped over this resistor should be around 1V
It's valid for all Salas shunt regulators?
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Old 28th September 2012, 02:25 PM   #5387
roender is offline roender  Romania
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Is valid for any shunt regulator, not only SALAS. Actually, is valid for any regulator who draw "constant" current, either series or shunt.
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Old 28th September 2012, 02:30 PM   #5388
merlin el mago is offline merlin el mago
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Thank you.
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Old 28th September 2012, 06:02 PM   #5389
Salas is online now Salas  Greece
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The simplistic Salas low voltage shunt regulator
Merlin maybe you remember older phonos that we used one sometimes.
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Old 28th September 2012, 07:10 PM   #5390
merlin el mago is offline merlin el mago
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Thanks Salas, I use also RC but to down the voltage never measured to give 1V across the resistor.
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