3 terminal Jung Super Regulator Kit

[peranders]

Originally posted by dipchip
Hi everyone,

I have completed the layout for a 3-terminal Super Audio Regulator. (I Hope!)

The design was very generously given to me by ALW.
from ALW Audio

I modified his design slightly to make it fit into a 3 terminal
78xx and 79xx footprint. (But I still have the original option of
the sense pins, if you hardwire them)

This voltage regulator has a normal linear pre-regulator that could be removed if needed, followed by a Walt Jung super low noise voltage regulator.

Dale (harvardian) and I, are going to try to offer this board (and a negative version) as a kit.

I named it the APOX-JR+ and APOX-JR-

I posted pictures of the layouts, so I would really like some feedback before I finalize the board layouts.

You can see the designhere

Is anyone interested in a board like this?

Thanks,
Craig Beiferman

What happened to your regulator. Not alive yet? Coming soon... 2003

[Fred Dieckmann]

It's hiding....... trying to keep from becoming your (and others) regulator.

I have a design but am thinking of writing an article for one of the audio hobbyist magazine or websites. I don't know if it would be suitable for this forum since it is a shunt regulator and assumes knowledge of the load AC and bias current as well as proper heat sinking.

Maybe a little more useful here would be a modification of the "three terminal IC type" with a power IC and an external voltage reference. I have a device picked out and may have the prototype under test this week or early next week. The adventure with the nose set me back about 6 weeks and home and car repair has pretty well shot most of this week. I sound like Grey..... maybe I will cut him a lot more slack next time the issue of delay due to more pressing commitments to more pressing issues surfaces. Good picture of the Audiocom regulator. I missed it. They have another one that is supposed to be much better.

[fmak]

Originally posted by peranders

Fred, Audiocom's regulator is pure Sulzer regulator, LM336 2.5 volts, OPA27 and the opamp is feed from the unstablized side.

Nice piece of engineering altough the cap at the top isn't soldered!

The pcb has groundplane which is connected to "in".

----------------------------------------------------------------------------------
I used one to power an XO. Totally useless, spews out harmonics like a sick man. With a resistive load, all is sweetness.

[Fred Dieckmann]

Sounds like instability to me. Does this thing have any Elko (electrolytic) bypass caps on the board. Ones on the main PCB are going to be too far away. Anyone who plans on building a three terminal regulator replacement board had better try stay close to the foot print of a TO220 device. These things seen to be stuck pretty close to their filter caps and even each other. A big PCB (relative to the size of TO220 package is not going to fit in many if not most products. I would go SMT for everything but the elko filter caps. These I would mount on the other side of the board, using radial caps but laying them down flat against the PCB and securing them with a small dab of RTV (Silicone sealer) This circuit could be done if the preregulator circuit is not used, but is still a daunting task for a good layout with a small footprint and component height. Just because the Audiocom is not a good design, I wouldn't rule out a drop in board for TO220 device replacement. It can be done. In absolute seriousness, I think this would be a good project and be extremely useful for updating equipment with tight real estate requirements around the Three terminal regulators. If anyone is interested (yes you too P-A) I will be happy to offer further advice.

[Fred Dieckmann]

"The pcb has groundplane which is connected to "in" - P-A/

I am pretty certain that is not a groundplane ( its not connected to ground for one thing) The pass transistor is SMT and the surface area of the "plane" is connected to the collector: It is a heat sink using the
PCB "plane" area.
Go read some ap notes for SMT power transistors and this trick is explained in more detail. The Zetex website has some good info on this I believe, since I saw some stuff on this in one of their data books. Maybe it doesn't get warm enough in Sweden to worry about this, but it sure does in Texas!

Later,

Tatoo

[peranders]

Fred, the IN-pin is connected to the backside (plane) which is connected to the collector which is connected through 15 vias. The power plane has only one trace. It's the power to the reference from the real output. Otherwise it's a whole power plane which, Fred I know, serves as a heatsink. Fred, I won't have to read books for seeing this.... I'm using my eyes only, because I'm holding the regultor in my hand.

About decoupling caps: How many do you see? Correct not too much. It's the one which unsoldered at the picture. The GND trace is a thin (15 mil!) trace along the sides of the pcb.

I can imagine that this regulator is not very well suited for difficult loads.

[peranders]

Originally posted by Fred Dieckmann
I have a design but am thinking of writing an article for one of the audio hobbyist magazine or websites. I don't know if it would be suitable for this forum since it is a shunt regulator and assumes knowledge of the load AC and bias current as well as proper heat sinking.

He, he, you are joking again but why don't you do something. It might be interesting.

[grataku]

Yeah Fred, audioxpress would be good (if you like a low impact journal ). It would have to be a complete working thing though.

[janneman]

Originally posted by Elso Kwak



But you are wrong, Jan (and Lars too). Just tried it!

Hi Elso,

Saying you tried it doesn't say anything really. What was the result, did you compare the two methods, how did you decide that one was to be preferred over the other??

Jan Didden

[Elso Kwak]

Originally posted by janneman



Hi Elso,

Saying you tried it doesn't say anything really. What was the result, did you compare the two methods, how did you decide that one was to be preferred over the other??

Jan Didden

Jan,
I have no comment, deleted my post.