Salas SSLV1.3 UltraBiB shunt regulator

[Salas]

Make sure the LEDS are not reversed for placement. Compare the 5V positive to the 15V positive. Are there any construction or parts differences? Check voltages in key places on the 15V sections. Like C1 to GND, Vgs, Vbe.

 

[kenneth_obee]

I don't think there was opposite equivalent type to use. If anybody knows of low gate threshold Logic Level P-MOS will be nice. In case of only such N-MOS available, a trick would be to make two positive regs with those and then use them floating with middle point as "zero" like stacking batteries in series. The lower reg in the stack is then seen as "negative".

Hi Salas,
I just come up with a idea. What if I add a LED in series with the output and the load?
What I am trying to do is to output 4V to dam1021. Can green LED be used in this case to produce +/-4V output from UltraBiB?

 

[Salas]

The Led has mA nominal spec, some noise, and some resistance (few Ω). If the load's mA draw is so low it won't burn it, it can be put there but the other two caveats will remain. Diodes can handle more current but show lower Vf. More than one can be used in series. They also have some noise and some resistance. Adding up.

 

[brian92fs]

Quick question... Spent 15 minutes searching and can't find an answer

What does the SSL and BiB in the name stand for?

 

[kenneth_obee]

Quick question... Spent 15 minutes searching and can't find an answer

What does the SSL and BiB in the name stand for?

SSL = Salas Shunt Low voltage
BiB = Black in black.

am I right?

 

[Salas]

Back in black actually. Its borrowed from the music world. From an AC/DC song. PSU turns AC to DC...
Marked the return to black boards phase after the Mez, Hypno, FSP, "blue period". No, that one does not imply Picasso.

 

[kenneth_obee]

Back in black actually. Its borrowed from the music world. From an AC/DC song. PSU turns AC to DC...
Marked the return to black boards phase after the Mez, Hypno, FSP, "blue period". No, that one does not imply Picasso.

interesting

 

[Harry3]

Bib

 

[Salas]

Curiously enough there are AC/DC baby bibs on ebay and Amazon

 

[Salas]

interesting

The 1.1 version had "Back in Black" indeed. Then the people started calling it BiB and the acronym stuck.

 

[Rush]

The 1.1 version had "Back in Black" indeed. Then the people started calling it BiB and the acronym stuck.

I was at this year's BAF and during Nelson's talk, he mentioned, that if you have a new design you want to share, the first thing is to name it something cool.

Back in Black is indeed cool.

Rush

 

[yunyun]

Make sure the LEDS are not reversed for placement. Compare the 5V positive to the 15V positive. Are there any construction or parts differences? Check voltages in key places on the 15V sections. Like C1 to GND, Vgs, Vbe.

The problem has been solved. The problem is the wrong polarity of the LED.

More correctly, the polarity of the LED must be measured first, and cannot be judged solely by the lead length.

 

[yunyun]

Look at the photo at this time the LED is lit, that is to say that input the positive voltage to the negative pole of the LED, it will be lit. In other words, the polarity of the die is reversed.

 

[Salas]

Manufacturer says short lead is cathode: http://www.kingbrightusa.com/images/catalog/SPEC/WP113IDT.pdf

 

[yunyun]

Manufacturer says short lead is cathode: http://www.kingbrightusa.com/images/catalog/SPEC/WP113IDT.pdf

The problem is some of them in short lead is not cathode...

Take a closer look at the internal structure of the LED in the photo I posted.

 

[yunyun]

Finally, all of them can be output normally, but the output of 15V is only about 170-180mA, which was originally set to 200mA, and the loss may be greater than expected.

 

[Salas]

What value is R1 and what is voltage across R1?

 

[lasercut]

Two bridges and dual secondaries are the better (and more expensive) choice of course.

I have dual secondary but one schottky bridge (coming from powering TPS7A +/-regs) and big banks of FR caps. I was going to connect this to +/- ultra bibs, bypassing onboard rectification, what makes 2 bridges better?
is it just to share the load?

On a side note, SR506 schottkys were some of the best sounding diodes for audio I found, better than MBR10010 and even Cree SiC diodes.
I have seen people say that they preferred the technically inferior fast switch/soft recovery diodes to some schottkys so I will be interested to try the Ultra Bibs MSR860s too, since SiC should also be technically superior to the Si schottkys.

 

[Salas]

Here are the arguments in a nutshell:
Dual Bridge Rectifiers in PSU - why?

 

[savvas]

I think that Tea-Bags now supplies his kits with FFPF30UP20STU Fast Recovery diodes. Very good choice, I have them in my present regs and they don't sound inferior to LQA Q-speed which I've used in the past.
SiC diodes have to be your cap of coffee, they sound different from everything else