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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 26th February 2014, 06:31 AM   #6331
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Move to sense lines. Don't keep on feed points.

Wideband noise is a nuisance, difficult to know what is what when measuring with scope on a rail, especially when its digital. Look here EEVblog #441 - How To Track Down Common Mode Noise - YouTube

For own regulator noise we are OK with the SSLV1.1 look at the Linear Audio test fig 7 (middle of page links) with just 220uF Vref cap and ~100 mA CCS, a conservative example. We are just looking to avoid extra things.
http://www.linearaudio.net/index.php...d=39&Itemid=64
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Old 26th February 2014, 07:10 AM   #6332
taisho_daniel is offline taisho_daniel  Philippines
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Thanks Salas, and thanks for the reference. Looking forward to watching the video later.
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Old 1st March 2014, 07:41 PM   #6333
PreSapian is offline PreSapian
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sorry for the dumb question but how would i configure the regulator to be used as a floating supply for sen i/v which requires 18v?

+/- 9v on salas with the ground floating?

thanks in advance.
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Old 1st March 2014, 11:59 PM   #6334
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
In a pretty typical way like when stacking batteries. You could pre-test on two dummy load resistors in series between their outer pins and middle point. That is when you want a floating symmetric out of two positives. If you just want a floating 18V positive you make a single but don't associate its cold side with any ground in the client or chassis.
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Old 5th March 2014, 04:40 PM   #6335
cwtim01 is offline cwtim01  Hong Kong
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Default Latest version

Hi,

I read from the first post to page 280 of this huge thread, taking notes as I read, and it was up to version 1.2 then. I reckon it's probably more efficient if I could start from the post where the latest version of Salas's shunt regulator design was published.

Could someone point me to the post/page where the latest version was introduced.

Thanks in advance.

Last edited by cwtim01; 5th March 2014 at 04:42 PM. Reason: typo error
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Old 9th March 2014, 11:03 PM   #6336
jtwrace is offline jtwrace  United States
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Where can we find purchase details and parts needed? Specs also. :-) Like the poster above this thread is HUGE!!!
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Old 9th March 2014, 11:28 PM   #6337
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Guys, see links in post#2. For boards on version 1.1 only ask Tea-Bag who organizes GBs.
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Old 9th March 2014, 11:43 PM   #6338
cwtim01 is offline cwtim01  Hong Kong
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Thanks, missed those links in post #2 when I first read the thread.
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Old 14th March 2014, 01:50 AM   #6339
taisho_daniel is offline taisho_daniel  Philippines
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Phew. It's been a while since I last reported back in this thread. Work and stuff got in the way.

Anyway, I tried out Salas' last suggestion, moving the 47uF to the sense lines. That didn't change anything. Funny thing was tho, when I removed the 47uF from the sense lines, it still didn't change anything : the sound I was hearing was still sub par compared to when I first auditioned the system after improving the Vref cap to 1000uF FMs.

I probably messed something up when I started tinkering around with the zobel caps... A couple of suspects
* re-soldering at the DAC feed point (5.2V, 200ma) resulted in the output wires being not as twisted as before, there's a more than 1 inch loop that's not twisted
* I now get a funny reading when I check for a short between the + and GND points for the XMOS feed point (5V, 400ma). Black lead on GND, red lead on the +, DMM shows no continuity. However, black lead on +, red lead on GND there's a reading of 200k-300k ohms or so. The other feed point doesn't have this. Any idea how to resolve this?

After I fix those problems, I'll try out the 47uF on both feed point and sense lines again, as the earlier experiments seem to be invalid.
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Old 14th March 2014, 06:11 AM   #6340
taisho_daniel is offline taisho_daniel  Philippines
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Question : how much of what I've tried out with the Zobel arrangement for the BiBs applies to the Reflektor?

The dual transistors I originally planned for are still a while out since there was a problem with the order and then there's international shipping, but I already have the pass MOSFET, and I have 48 pcs left over of the BC560C, so I can already include that for my weekend plans.
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