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-   -   Sulzer Reg-Source or substitute for MMSZ6V8T1 zener (http://www.diyaudio.com/forums/solid-state/4879-sulzer-reg-source-substitute-mmsz6v8t1-zener.html)

Dr.H 29th July 2002 09:58 AM

Sulzer Reg-Source or substitute for MMSZ6V8T1 zener
 
Hi All,

In the Sulzer and Pooge 5.1 power supply regulator circuit diagrams as posted in this forum, there is a zener diode specified:

MMSZ6V8T1


Anyone know what the specs on this is since I am probably going to have to find a substitute, preferable not surface mount.


Many thanks
Ryan

Nicke 29th July 2002 10:08 AM

Try the voltage reference LM329 from National.
I am using that in my regulators(Jung´s superregulators).

Nicke

Dr.H 29th July 2002 10:31 AM

Thanks Nicke

jan.didden 29th July 2002 10:31 AM

Sulzer reg etc
 
The zener is a 6.8V type, the LM329 provides the same nominal ref voltage (or almost; I think it is spec'ed at 6.9V), but with better performance.

Jan Didden

ced 29th July 2002 11:24 AM

sulzer circuit
 
Does anyone perchance have the board layouts (and if possible a stuffing guide) for the sulzer circuit? I rustled up one and although it worked fine it sounded terrible- no dynamics etc etc. which I suspect was down to layout
Ced

HarryHaller 29th July 2002 11:37 AM

MMSZ6V8T1
 
http://onsemi.com.cn/pub/Collateral/.../mmsz2v4t1.pdf

Use the LM329, it is much better than a zener.

http://www.national.com/ds/LM/LM129.pdf

H.H.

Dr.H 29th July 2002 01:25 PM

SULZER BOARDS, YES PLEASE
 
Thanks to all for their responses.
Given the experinece of other DIYérs, I would also be very interested in board layouts etc!!

jan.didden 29th July 2002 02:04 PM

Re: sulzer circuit
 
Quote:

Originally posted by ced
Does anyone perchance have the board layouts (and if possible a stuffing guide) for the sulzer circuit? I rustled up one and although it worked fine it sounded terrible- no dynamics etc etc. which I suspect was down to layout
Ced

Search the threads on the subject of these supplies - couple of weeks ago I think. IF the problem is layout related, it most probably is due to bad grounding strategy. Rigouresly (is that spelled right?) keeping to star grounds, not sharing multiple returns in a single wire often solves layout related problems.

Jan Didden

carlmart 29th July 2002 06:35 PM

Sulzer layout
 
Jan,


A few years ago you wrote an article on The Audio Amateur with a clever and simple DAC using an LCR filter.

On that project you implemented a Sulzer supply where you used large capacitors at the output. 10.000uF if I'm not wrong.

But on the latest Jung/Didden/Galo version it was suggested as a no-no using more than 120uF output capacitors or the circuit might oscillate.

Did you see any oscillation on that circuit of yours?

BTW: back then I had been thinking of using star connections for ground, V+ and V- tracks, and you were one of the first designers that implemented such tracking on a serious project.

How far does it go this star connecting? Should it be applied as much as possible? Where?



Carlos

ced 31st July 2002 02:49 PM

Star Grounding
 
2 Attachment(s)
Jan,
thanks for the tip. I've tried redesigning a positive sulzer board as you suggested with rigorous (think that is the way it's spellt) star grounding and was wondering if you (or anyone else) might comment on it. Is this what you were thinking of or does it have any obvious faults? If it seems ok I'll cook one up in the next couple of weeks and see if that works.
It uses a tracking prereg providing 4V headroom for the circuit, outputs 24.5 V and has R2 matched to R3 as I read somewhere that it aids DC stability and drift. Output transistor is a bd135 but that should be ok, shouldn't it? D1 is the LM329cz.
Cheers
Cedric


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