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Old 26th January 2006, 12:18 PM   #1
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Default Sulzer regulator

Hi, Im currently deciding what regulator design to use.

1. Jung super regulator (expensive)
2. Sulzer regualtor (cheaper but doesnt have protection cicruit)

The question i would like to ask is, is it possible to add a current limiting circuit to the sulzer (1 transistor and a resistor) without adding additional noise to the circuit?
Or is there any other designs that i can consider?

Thanks
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Old 26th January 2006, 12:23 PM   #2
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A Jung Super Regulator isn't particulary more expensive than a Sulzer dito if you use the same parts. The basic difference is that the opamp of the Super Regulator gets it's power from the regulated side. The output stage is also a bit different to ensure the startup.

To add a current limiting is pretty easy, just add a current shunt and a transistor.
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Old 26th January 2006, 12:26 PM   #3
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in terms of no. of component the jung has more. Harder to build hte circuit as Im using a veroboard. Anyway is the seluzar better with analog or digital supply?
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Old 26th January 2006, 12:30 PM   #4
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Hard to say about you last question but the pcb is very important if you want to have high performance.

Maybe LM317/337 is sufficient for your needs?
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Old 26th January 2006, 12:37 PM   #5
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Dont think i will go the LM317/337 route...since im doing a whole circuit might as well do it better. My cd player currently has 78xx/79xx. For the sulzer how important is the layout as compared to the Jung?
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Old 26th January 2006, 12:51 PM   #6
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It's a bit less important since it's a bit slower (can't be made as fast as a Super Regulator). The most important thing is to plan how the ground should be done. Draw currents only where the voltage drops don't interfere with the rest of the circuit.
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Old 26th January 2006, 12:53 PM   #7
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Quote:
Originally posted by starushz
Dont think i will go the LM317/337 route...since im doing a whole circuit might as well do it better. My cd player currently has 78xx/79xx. For the sulzer how important is the layout as compared to the Jung?
Layout is going to affect the impedance of the Jung regulator pretty dramatically -- at least according to Walt himself -- for the lowest impedance version the ground returns were all drawn in exactly the way the authors intended.

In the last of the series of articles on the super-reg Jung used an LM317 as a constant current source, as a current regulator.

finally, in the last series of the article they did compensate the opamp, surrendering to the fact that the circuit was capable of oscillation.

you can search the archives of EDN Magazine under Walt Jung to see his 1997 article.
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Old 26th January 2006, 01:54 PM   #8
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Jack, "dramatically", it depends from where you start. If the gentleman here tries to use an AD825 or similar I'm pretty sure he gets into trouble but a slower opamp will probably work _if_ the layout of the Vero board is as good as possible.

I must also correct you a bit. The LM317 was used as a pre-regulator creating a constant voltage over the pass transistor.
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Old 28th January 2006, 07:47 AM   #9
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Regarding the sulzer, what is the max current draw?
I was intending to use a LM317 to preregu the voltage. By putting a fuse before the LM317, it would also limit the current ( 1A in my case). Is that correct?
Also is there any other transistor to replace the 2n3053?
How about the BC637? for negative voltage the BC638?
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Old 28th January 2006, 08:45 AM   #10
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Max current is determined by max base current you can feed the pass transistor with, the power dissipation and the cooling and in the end max ratings for the transistors.
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