Building a symmetrical psu B1 buffer

[regiregi22]

Maybe fully populating it with Blackgates and silver plated gold wire?

[Salas]

No. Maybe with adjustable V1.2 shunts that I beta test currently, they have only film caps on the vrefs and outputs. Remote sensing to star earthed load nodes, some investigation on what happens in higher amplitudes and with what voltages and mismatches or degeneration the B1 core could be linearized on peak swings.

[Ian444]

Originally Posted by Ian444

- from Oct 6th -
As time goes on I am very happy with the symmetric shuntreg B1 buffer, it may be the mother of all buffers. Very good details and still sounds very smooth is how I would describe it

Since early October this has been a permanent addition to my modest sound system, possibly the best piece of audio gear I have ever built. It gets used most nights. From the ashes of a nearly-failed group PCB design/buy arose this current PCB design, and it got put into production, thanks to a few dedicated people. Just wish to express my thanks again. DIY is so strong these days...thanks to the willingness of more experienced people to share their ideas. Sharing is giving from the heart, it is so good to see this happen, in a world that seems to be becoming more dog-eat-dog every year, or maybe I'm just getting old. Anyway, back to the gen mods, not all designs stand still...

Ian.

[sugden]

Hi Salas, I start to build my DCB1, but after test all my 50 pcs jfet, all Idss are from 6.70mA to 7.01mA. May I know is it ok to match them with Idss=7mA ? I using 9v battery to test them, battery "+" -> DMM -> drain -> source and gate -> battery "-" . May I know is it correct method?
I newbie in DIY audio, your advices are very much appreciated.

[regiregi22]

sugden, you are right in using those 7mA matched fets. Though, they don't need to be matched, just to have close values of idss.
Something like pairing a 6.9mA and a 7.1mA would be enough. But the more closed, maybe the better. I suppose.

[Salas]

Originally Posted by sugden

Hi Salas, I start to build my DCB1, but after test all my 50 pcs jfet, all Idss are from 6.70mA to 7.01mA. May I know is it ok to match them with Idss=7mA ? I using 9v battery to test them, battery "+" -> DMM -> drain -> source and gate -> battery "-" . May I know is it correct method?
I newbie in DIY audio, your advices are very much appreciated.

What regiregi22 said is OK. Method OK.

[sugden]

Thanks, for the advice. Will put up the photo once I completed.

Best Regards
MartinTie

[merlin2069er]

If I use an external lightspeed attenuator on the input of the dcb1 buffer, should I change any of the input/output resistors?

I might be integrating the lightspeed eventually.

Any suggestions?

[Salas]

No changes if your LSPD isn't more than 22k impedance.

[samoloko]

Originally Posted by Salas

I am learning from CRT that they have run a 17 builds tube vs solid preamps BLIND panel test in Indonesia and they have ranked the DCB1 in top 3rd among tube and SS builds with gain, not buffers, and over 4 times its cost. That was in the ''Solfegio'' forum.

Auto translation:

''Specifically for B1 and Salas SF, I think Price / Performancenya very promising with a cost of less than 1 / 4 (a quarter) the other champions, he was able to show dozens performancenya outperformed other systems, thus Buffer B1 is worth if it is considered Salas Project DIY a very decent build.''

http://img14.imageshack.us/img14/571...kprambutan.jpg

Hey, this one does not even have an LSPD or a switcher...What is that, extra filter caps with long cabling? Could have been done and do better.

Hi Salas

are there benefit to add more value than 4700uF for smoothing cap
can you advice your values for electrolytic caps