Shunt Regulator

[PoweRex]

Hi guys,
Can anybody provide the original parts list for the Borbely "EB-906/255" All-Fet Shunt Regulator ?
Thanks.

 

[AndrewT]

Hi,
I found the reg schematic inside an Are Waagbo article.
But there is no BOM and the schematic has no values.

I do not have that reg in any of Borbely downloads.

 

[as_audio]

The article is in AudioXpress 2-2008.

 

[ticknpop]

Yes, no parts list - almost all the parts are discontinued, if you can find them then we’ll talk about the resistors

Input 2sk389/2sj109 or matched pair 2SK170BL /2SJ74BL
Cascodes 2SK246/2SJ103 nice if you match pairs , but not necessary
Drivers 2SK982/2SJ148
Power devices 2SK2013/2SJ313 or for high power 2SK 1529/2SJ 200 and 2SK1530/2SJ201
E102 current sources

LM329 for vref , you can make quieter

 

[as_audio]

A picture is here :
https://www.diyaudio.com/forums/pow...e-shunt-voltage-regulator-85.html#post2106110

 

[as_audio]

Found the complete article in a russian forum :
http://forum.vegalab.ru/attachment.php?attachmentid=192287&d=1380107251

 

[PoweRex]

I already have this article but it doesn’t show the components values.

 

[ticknpop]

Maybe you can read the resistor values from the picture, maybe I have a list somewhere,

I changed LM329 Vref to LEDs

I can take more pictures so you can see all the resistors. There are 10 Borbely shunts in this balanced DAC , it uses Erno’s IV converters biased at 90 ma

Theres a 2 ma current source that got replaced with a 1.5 k resistor, but lafter I put in the original current souces and it worked OK

 

[as_audio]

I already have this article but it doesn’t show the components values.

This is true, but you can work it out yourself or with help of forum members.

As a start :
- your input voltage
- desired output voltage
- load current
..
The fets however will be hard to find and I recommend redrawing to bipolar.

 

[john jones]

These shunts seem component critical and may need a few mods to prevent oscillation. See this article in AudioXpress: Shunt or Not - Looking for the Ultimate Audio Voltage Regulator | audioXpress
In light of expense and difficult to obtain parts, maybe a Salas shunt would be easier?

 

[as_audio]

This is the article referred to in post 1, 3, 5 and 6.

 

[PoweRex]

These shunts seem component critical and may need a few mods to prevent oscillation. See this article in AudioXpress: Shunt or Not - Looking for the Ultimate Audio Voltage Regulator | audioXpress
In light of expense and difficult to obtain parts, maybe a Salas shunt would be easier?

The question remains the same : what are the passive components values of the schematics shown in Fig4 and Fig5 of this article?

 

[as_audio]

Again : This depends on

- your input voltage
- desired output voltage
- load current

"Fig4 and Fig5" are Fig 6 and 7 in the print version.

 

[PoweRex]

Considering both the EB-906/255 and EB-806/273 :

- the input positive and negative shunt currents, adjusted respectively by R1 and R2, will set the allowable positive and negative load currents
- the desired positive and negative output voltages are adjusted respectively by P1 and P2

All the rest will remain the same. Do you know the values?

 

[as_audio]

I usually calculate the values.

 

[PoweRex]

Ok. Go ahead...

 

[as_audio]

See post 13

 

[bimo]

Example: Simple Mosfet Shunt Regulator

It tested by my friends. Several of this design built and until now no problem found.

 

[PoweRex]

See post 13

As you prefer...
For both positive and negative sections :
Vin:30V / Vout:24V / Iout:150mA

 

[as_audio]

Mother told us to say "please".

However looking at your post 14 it seems you are able to figure it out yourself,
isn't it ?

Post 18 : this is nice, all required values are there. For 24 V replace Zener D1
(D5) with Z11 or Z12, for 150 mA maximum R1 in the current source is 4 Ω.
So choose R1 smaller according to shunt and regulator supply current.

Bimo, what is C3 (C17) good for ? Please explain.