Simple Super Shunt and Simple Super Shunt w/CCS vs. JSR03/05 (and other series regs)

[joho]

ahum,

Thanks Jacco

[joho]

Hi Hollowman,

I was very busy this day with new regulators and i must go to a concert now. Tomorrow i try to give a serious answer when the alcoholics went out of my head


Gr.
Johan

[Zen Mod]

Originally posted by joho
ahum,

Thanks Jacco

naah
too tidy .......

[joho]

Originally posted by hollowman


So, bc550/bc560 are your preferred substitutes for the orig authors choice of BC549/BC559, respectively?

Right. But that leaves out the npn BC549C, in the SSR w/CCS schematic (see image posted earlier), whose base is between Vz and 100R. I assume this is changed to BC559C (PNP) for the neg supply.
c560 are your preferred substitutes for the orig authors choice of BC549/BC559, respectively?

Hi Hollowman,

BC550/560 are "lower"noise than the BC549/559 but i think it doesn't matter which one you use in this application.

For the shuntpart of the schematics you need a driver for the mosfet. Please look careful at the schematic in post 6!!!
If you like you can change R4/R8(56R) for the Borbely or Zenmod current source. For me it didn't made any difference but for you???
What preamp do you use? What speakers? What source?

I.M.H.O. the positioning of the loudspeakers and the roomaccoustics do much more than exclusive high audio grade components. So use standard industry components and everything will be o.k.

Gr.
Johan

[hollowman]

Originally posted by joho
What preamp do you use? What speakers? What source?

Not sure why/how these components relate to the discussion but...
Pre-amp/integrated (headphone amps): heavily-modded Van Alstine FET-Valve; heavily-modded Meijer Corda headphone amp; PPA2 DIY headphone amp; modded GoVibe headphone amp (using as "pre-amp" of sorts!)
Speakers: modded Paradigm Export Monitor Mk2; modded Vifa Studio; various DIYs based on projects/plans avail. on the Web. But I mostly use headphones or earphones, like Senn 650, Shure 530, Beyer 880 and Grado 325i
Source: Rarely use analog VPI 19 Jr/Rega 300/Sumiko BP Spec.; mostly use heavily-modded Philips 650, modded Pioneer DV59AVi and heavily-modded MF A324 DAC

I.M.H.O. the positioning of the loudspeakers and the room acoustics do much more than exclusive high audio grade components. So use standard industry components and everything will be o.k.

While I agree that those other (and unrelated) high-fidelity standards do matter a lot (esp. re: high-grade/boutique audiophool parts), we're getting off-topic. The topic at hand is comparing/contrasting specific types of shunt regs. Speaking of which, here's another one (mostly based on Ed Simons' design in AudioXpress June 2007):
+/-15VDC, 400mA, MOSFET Shunt Regulator -- schematic

[joho]

Hi Hollowman,

If you mostly use headphones, positioning of speakers and roomaccoustics don't count,that's clear.
What i tried to say is; you can discuss about component/part
choices p.e. bc550 contra some japanese counter part. Or even a bc550 brand philips contra fairchild. If your listening conditions/your golden ears are not very,very good, you hear no difference.(english isn't my native language so i hope you understand me well. If not there is always Jacco).
You're audio set looks serious. You collect headphones?
A friend of mine has the topmodel of grado and i must say it sounds very impressive.

O.k to the point. Different shunt regs... the only thing i can say...
build one and listen.

At the moment i'm listening to a series regulator. It's a two stage design. In fact a zener stage around a current source+emittor follower and a local mosfetfollower with a expensive 0.1uF polyp.cap as last capacitor.
And i like it. It's better than the shuntreg but i'm waiting till the weekend for the end conclusion.

Gr.
Johan

[hollowman]

Originally posted by joho
At the moment i'm listening to a series regulator. It's a two stage design. In fact a zener stage around a current source+emittor follower and a local mosfetfollower with a expensive 0.1uF polyp.cap as last capacitor.
And i like it. It's better than the shuntreg but i'm waiting till the weekend for the end conclusion.

Can you post a schematic of this series regulator? Also, do you recommend any particular brand/type of Zener -- both for your shunt reg and this series regulator?

[hermanv]

Originally posted by joho
Hi Gents,

<snip>
As i said, i'm fooling around with different(shunt) regulator configurations but everytime that last cap is the bottleneck.
Yes, the panasonics FC-series are also very good for me. When i swap it for an elna audio grade i become depressive. But in fact we are talking about colouration.
How to solve that?

Gr.
Johan

It is possible to find films at that size for not insane prices (they are big though), but at that current is 100uF really necessary?
http://www.northcreekmusic.com/Zen.htm

How about 200uF film for $20.00
http://www.northcreekmusic.com/Specials.htm

[joho]

Hello again,

Attached the schematic of the regulator i'm testing/listening to.
You must try different zener/diode combinations to get the output voltage you need. Please also test it with the current you need because there is no feedback and the voltage get's a bit lower when the current raise.
The mostfetfolower is a la Charles Hansen's Ayre V3 if i'm right.
Personally i like Mundorf Suprime cap's but they are not cheap and small. The northcreek cap's are new for me. The price is better than the Mundorfs. For sure when the dollar is low and the euro high. But shipping cost...
I do not prefer any particular brand/type of Zener. When i buy some in the shop at the corner it's always a supprise what you get.

Gr.
Johan

[Onvinyl]

Hi,
zeners as references are pretty noisy. Their Vn can be as high as 2µV/1/2Hz, where even the 1M-Resistor shown has 128 nV!
It is however not so easy to use low noise references since they are normally low voltage. I use bypassed resistor stabliized with a FET CCS, but it is not easy to fix the voltage.
Any idea to circumvent this is welcome, and, at least for high gain circuits, pretty much a must.
I don't see how the proposed local regulator could work. Does it depent on leakage current?
Rüdiger