The simplistic Salas low voltage shunt regulator - Page 398

Tea-Bag · 13th May 2011, 11:22 PM

Quote:

Originally Posted by RCruz

Maybe I am missing something but I can not figure R107 value 0.25r ?

1R
It's on the build guide on page 6.

Tea-Bag · 13th May 2011, 11:23 PM

Here is the GB thread.

http://www.diyaudio.com/forums/group...ml#post2571174

RCruz · 13th May 2011, 11:29 PM

On page 6 I see the schematics but without any values. I searched the pdf and got no values for R107.

Can it be ?

Tea-Bag · 13th May 2011, 11:46 PM

It could be....

Here --- look for this. Maybe you should download again. Salas has updated.

R102,202,302 270R. R106,206,306 270R/27R. 270R for MOSFET output. 27R for BJT output. 1/4W
R108,208.308 47R 1/4W
R104,204,304,107,207,307 1R 1/4W
For R103,203,303 1/4W resistors & R105,205,305 Trimmer Bourns 3296Y style, read appendix 1

BMW850 · 05:30 PM

Hi All,

When I connect 3 (5 volt) Sallas regs from one 12 volt Transformer I blow up a diode on the minus side, see attachment.

2 Sallas regs works fine but when I connect the third one to the DDDAC receiver board (only the 5 volt Sallas reg for the 74VHC4040M) it goose wrong.

Now I connect the 2 Sallas regs to 1 transformer everything is working fine.
I connect another 12 volt Transformer to the 5 volt Sallas reg B on the DDDAC receiver board and now are all 3 Sallas regs working.

Can someone tell me why are 3 Sallas regs NOT working with 1 Transformer?
I must connect 9 Sallas regs on 1 Transformer for the DDDAC also for the DAC towers.

Regards,
Rudy
Edit: 12 volt 500 VA Transformer the right one is for the DAC.

Salas · 14th May 2011, 05:12 PM

Too low an impedance created and too hard a current pulse for a small diode maybe. Is it a big enough transformer also?

BMW850 · 06:01 PM

The diodes blow up are 1N4007 now I use 1N4004 and that works fine.
The Transformer I use on the picture are without diodes

I must connect 9 Sallas regs on 1 Transformer.

2off 8.4V 800mA (DAC Tower à 12xTDA1543)
3off 5V 80mA (Receiver board)
2off 3.5V 80mA (DAC Tower à 74VHC125N)
2off 3.3V 80mA (à VDD1 USB Receiver & DAC PCM2707PJT; 74HC08) (à VDD2 Tent XO Clock 12Mhz)

Here you have a PDF file: http://www.dddac.de/files/dddac1543mk2ver50.pdf

Regards,
Rudy

schultzsch · 14th May 2011, 08:15 PM

back again

today i have replaced my transformer and experimented an 12 volts Pb acid accumalator with my Salas low shunt regulator V1.0 (5v) which powers up my M-Audio Transit usb soundcard.what i remarked is a more articulated sound.why there is audible difference between those two 12 volt supplies ? or should it be ?

thanks

ps : i like the sound with the accumulator the most

Salas · 14th May 2011, 10:55 PM

Your Pb DC source is naturally smoother and non polluted than off wall rectified AC.

schultzsch · 14th May 2011, 11:30 PM

wondering what the difference would be in my jfet mm preamp?
i hope to get another two Pb accumulators(or to make an dc-dc converter(12v-30v)) and then i`ll give it a try.

13th May 2011, 11:23 PM	#3972
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	Here is the GB thread. http://www.diyaudio.com/forums/group...ml#post2571174 __________________ Salas Boards 2013 #2 CLICK HERE \| F6 Covertible PCB GB Boards Available \|DCB1 boards and KITS available PM\|SemiSouth R125, R100, R100A Available CLICK HERE \|F5TC Boards Sign UP CLICK HERE

13th May 2011, 11:46 PM	#3974
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	It could be.... Here --- look for this. Maybe you should download again. Salas has updated. R102,202,302 270R. R106,206,306 270R/27R. 270R for MOSFET output. 27R for BJT output. 1/4W R108,208.308 47R 1/4W R104,204,304,107,207,307 1R 1/4W For R103,203,303 1/4W resistors & R105,205,305 Trimmer Bourns 3296Y style, read appendix 1 __________________ Salas Boards 2013 #2 CLICK HERE \| F6 Covertible PCB GB Boards Available \|DCB1 boards and KITS available PM\|SemiSouth R125, R100, R100A Available CLICK HERE \|F5TC Boards Sign UP CLICK HERE

14th May 2011, 05:42 PM	#3977
BMW850 diyAudio Member Join Date: Aug 2004 Location: North East of the Netherlands	The diodes blow up are 1N4007 now I use 1N4004 and that works fine. The Transformer I use on the picture are without diodes I must connect 9 Sallas regs on 1 Transformer. 2off 8.4V 800mA (DAC Tower à 12xTDA1543) 3off 5V 80mA (Receiver board) 2off 3.5V 80mA (DAC Tower à 74VHC125N) 2off 3.3V 80mA (à VDD1 USB Receiver & DAC PCM2707PJT; 74HC08) (à VDD2 Tent XO Clock 12Mhz) Here you have a PDF file: http://www.dddac.de/files/dddac1543mk2ver50.pdf Regards, Rudy __________________ It’s not what you know, but who you know “and where they are” Last edited by BMW850; 14th May 2011 at 06:01 PM. Reason: Typo

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13th May 2011, 11:29 PM	#3973
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	On page 6 I see the schematics but without any values. I searched the pdf and got no values for R107. Can it be ?

14th May 2011, 05:12 PM	#3976
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Too low an impedance created and too hard a current pulse for a small diode maybe. Is it a big enough transformer also?

14th May 2011, 08:15 PM	#3978
schultzsch diyAudio Member Join Date: Mar 2009	back again today i have replaced my transformer and experimented an 12 volts Pb acid accumalator with my Salas low shunt regulator V1.0 (5v) which powers up my M-Audio Transit usb soundcard.what i remarked is a more articulated sound.why there is audible difference between those two 12 volt supplies ? or should it be ? thanks ps : i like the sound with the accumulator the most

14th May 2011, 10:55 PM	#3979
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Your Pb DC source is naturally smoother and non polluted than off wall rectified AC.

14th May 2011, 11:30 PM	#3980
schultzsch diyAudio Member Join Date: Mar 2009	wondering what the difference would be in my jfet mm preamp? i hope to get another two Pb accumulators(or to make an dc-dc converter(12v-30v)) and then i`ll give it a try.