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-   -   Salas SSLV1.3 UltraBiB shunt regulator (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator.html)

sianturi 23rd May 2018 06:29 PM

Oh noooo! I just finished my V1.2R, and now we have V1.3?! :(

Earlier in this thread, you compared it with V1.1. What about V1.2R compared with this, Salas?

Salas 23rd May 2018 06:37 PM

No straight subjective comparison opportunity yet. 1.2R was a "speciality" reg, the 1.3 is much more doable for everyone. Technically the 1.3 is superior even over the 1.2R for spec numbers. In the parallel voltage section mainly, in the series current section it has simpler CCS.

ggetzoff 23rd May 2018 07:02 PM

Hey Salas,

Thanks for the new BiB! I needed a bipolar psu for my BA-3 pre build. So, this is arriving just in time!

Cheers,

Greg

Salas 23rd May 2018 07:02 PM

By the way, the negative section's Q1 orientation footprint has been corrected and I have already sent the files to Tea.

A build guide will be added as soon as I will be getting some answers about the R9's final generally recommended value vs max phase margin possibly attained audibility/not from a couple of the beta testers team hopefully until/in this weekend.

Salas 23rd May 2018 07:03 PM

Quote:

Originally Posted by ggetzoff (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5442510.html#post5442510)
Hey Salas,

Thanks for the new BiB! I needed a bipolar psu for my BA-3 pre build. So, this is arriving just in time!

Cheers,

Greg

:up: You are welcome

fedde 23rd May 2018 07:13 PM

@Salas Thank you for sharing this design.

I have a few questions:
1. What is the efficiency of the supply? E.g. in a Soekris DAC use case (180mA @ 10V positive, 60mA @ 10V negative)?
2. Do the active components get very hot (for same use case)?
3. Is there a specific current range where the regulator is effective in removing noise?
4. I presume the 50V rating of the C1 input capacitor can be lowered in case of 2x12Vac input (e.g. to 25V)? I would like to keep the design low profile.

Salas 23rd May 2018 07:30 PM

1. My cheapo mains power socket meter shows 7.6W for a 50VA 12-0-12 Vac toroidal and a positive/negative 200mA CCS UltarBiB 1.3 configuration. Should be about there when set for the Soekris situation too. Maybe about 8W. I have 235Vac mains right now.
2. No problem
3. Up to 100-150mA spare current the M2's current noise contribution is behaving reserved.
4. Sure. I only have 15.5Vdc on C1 right now with MUR120 diodes while using the mentioned toroidal and mains voltage (answer 1).

Also... Put 10k trimmer instead of 20k, if not interested to ever use the reg for a really high Vout, so to have more turns in your range of interest.

fedde 23rd May 2018 07:44 PM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5442541.html#post5442541)
1. My cheapo mains power socket meter shows 7.6W for a 50VA 12-0-12 Vac toroidal and a positive/negative 200mA CCS UltarBiB 1.3 configuration. Should be about there when set for the Soekris situation too. Maybe about 8W. I have 235Vac mains right now.
2. No problem
3. Up to 100-150mA spare current the M2's current noise contribution is behaving reserved.
4. Sure. I only have 15.5Vdc on C1 right now with MUR 120s using the mentioned toroidal and mains voltage (answer 1).

Also... Put 10k trimmer instead of 20k, if not interested to ever use the reg for a really high Vout, so to have more turns in your range of interest.

Thanks for the super quick feedback. Efficiency is good enough, dissipation should not be a big issue indeed. I already planned to go for the 10k trimmer, indeed should be more stable over time and especially easier to configure. I look forward to try this design out on my DAC! :p

Fedde

Salas 23rd May 2018 11:21 PM

Lets try some numbers:

Say for typical R1 values you use 2.2R in the positive and 3.9R in the negative. The formula* is CCSmA=600/R1. Thus 600/2.2=272mA & 600/3.9=154mA.

You said the Soekris current load spec is 180mA for the positive & 60mA for the negative. Because spare current in the reg is CCS-load then 272-180=92mA & 154-60=94mA. Balanced spare current on both rails is achieved, both M2s will dissipate the same. Zo and other characteristics will also be given a chance to be nearer in both sections.

The drawn current total should be CCSpos+CCSneg=272+154=426mA i.e. a very near total to my 200+200=400mA 7.6W pulling as measured test build. Should indeed be around 8W when set for Soekris because of the +26mA total in the described setting than the measured example's.

*When looking for R1 numbers through a CCS setting target the formula can be turned into R1=600/CCSmA. Say you go for 150mA setting, then 600/150=4R so 3.9R is the nearest. Its the one I just used for setting the UltraBiB's negative section current limit in the Soekris example.

feverdiy 24th May 2018 02:23 AM

Haha, My 1.1 version is still in progress, and 1.3 has been released. I am slow diyer. @_@
Is it worth to build 1.3 instead of 1.1? Mainly use for Soekris +-5V R2R ladder supply and 19V NUC.
How the sonic performance compare 1.3 and 1.1?

Thank you.


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