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Salas low shunt Group-design by Salas

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#564
quanghao said:
you are referring to cases A or B in the figure below, please specify
Click to expand...
Hi,
look at B5. It is a +ve and a -ve shunt reg combined to give a dual polarity supply. That is what we have in the DCB1. It can be powered from a dual secondary or from a centre tapped secondary.

Look at A4 + A5.
These are two -ve shunt.
Combine them by connecting A4gnd to A5-
You now have a dual polarity supply.
This version can only be powered by a dual secondary.

If you do make all the shunts -ve only, then it is very easy to modify the PCB layout to make it dual purpose, ie convertible from -ve to +ve.
Alternatively, the existing -ve shunt can have one jFET installed slightly differently to convert to a +ve shunt. This would allow any builder to create a dual polarity supply from a centre tapped transformer.


The only downside to going all -ve is that the instructions need to be more clearly detailed to allow both +ve and -ve versions to be assembled by beginners and less experienced builders.
If everyone builds only -ve versions we can all use exclusively Nchannel FETs and we can still create dual polarity supplies.
 
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#569
Externally powering a Hi Face USB to SPDIF needs a 1.2 volt, 3 volt for the clock and 5 Volt as well. The Buffalo 2 DAC requires similar voltages although their new Trident regulators may be even better. They certainly are much more compact being all surface mount with a shorter connection to the load which is a very good thing. They also run off of 5.5 volt DC (no AC rectification) so they don't drop as much into heat. I suppose people needing lower V regulation could source them from a Salas set up for 5.5 volt. Of course a linear 5.5 would be more efficient but I imagine I will want to hear both.
 
#570
AndrewT said:
using -ve shunts avoids the need to buy borrow or steal Pchannel mosFETS.
This saves money, makes for easier sourcing and slightly improves regulator performance.
The only down side I can see is that a centre tapped transformer cannot be used.
Click to expand...

nice idea, this would do also, but I do still prefer the extra low voltage 0-5vout seems i'm in a minority though
 
#573
AndrewT said:
Hi,
look at B5. It is a +ve and a -ve shunt reg combined to give a dual polarity supply. That is what we have in the DCB1. It can be powered from a dual secondary or from a centre tapped secondary.

Look at A4 + A5.
These are two -ve shunt.
Combine them by connecting A4gnd to A5-
You now have a dual polarity supply.
This version can only be powered by a dual secondary.

If you do make all the shunts -ve only, then it is very easy to modify the PCB layout to make it dual purpose, ie convertible from -ve to +ve.
Alternatively, the existing -ve shunt can have one jFET installed slightly differently to convert to a +ve shunt. This would allow any builder to create a dual polarity supply from a centre tapped transformer.


The only downside to going all -ve is that the instructions need to be more clearly detailed to allow both +ve and -ve versions to be assembled by beginners and less experienced builders.
If everyone builds only -ve versions we can all use exclusively Nchannel FETs and we can still create dual polarity supplies.
Click to expand...

I not see, what do you wnat me make the pcb??!
you can say simple??
EX:
3x +V
1 x Dual ( + and -)
Thanks
 
#574
Hi all,
I have my PCBs, I do not need any more.
I should not decide what Quanghao offers for the next PCB.

I offer advice on alternative ways to prepare the PCBs.
You, the Group Buyers, decide what you want.
You read the information and recommendations and decide if any choices are preferable to any others.
Make it a poll to find the most popular PCB.

You can ignore my advice if you want. I was simply informing what can be done and why I thought using Nchannel FETs was an advantage.
You do not have to agree. Just decide for your selves.
 
#576
My personal bias having purchased all of the parts for 10 sets of boards and receiving none would be another run of the same board assuming it is working as designed. If the new boards are redesigned to the point of needing new parts i would ask for the old files so i could make my own boards. I certainly do not wish to stand in the way of progress however and some of the ideas being presented are worth considering.

In truth because of the availability of the Trident low voltage regulators i now only want about 4 boards so i might have 5 or 6 kits of parts available for the old design in case there is any interest.
 
#578
Salas low voltage shunt regulator

Hallo quanghao,

Can you make for me a Salas low voltage shunt regulator.
You make now 5 units all on 1 board is no problem, must be a fully assembled kit.

3 units +5 volt max 80mA for my DDDAC MK2 SPDIF receiver replaces this unit:
http://www.dddac.de/pics/dddac1543mk...43mk2power.gif
You can also look on DDDAC website: www.dddac.de

And 1 unit 3,5 volt for the 74VHC125N DAC PCB.
1 Unit 3,3 volt for USB to I2S Converter.

I have a case with 4 separate transformers.
3 Transformers with rectifiers for my Shigaclone CD Transport.
1 ALWSR+ B&T ALWSR +5v Built & Tested Regulator - Shigaclone Board
1 ALWSR+ B&T ALWSR +8v Built & Tested Regulator - Trichord clock 4

And a 500VA 12 volt transformer with rectifiers for the DDDAC.

In the DAC case I have 2200uF Blackgate FK / LM7812 / 1000uF Blackgate STD.
The input for the Salas board is a 12 volt DC, so I need no rectifiers for DC on the 5 Salas boards.

Please tell me what the total cost are to The Netherlands.

Regards,
Rudy
 

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