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Old 7th August 2009, 12:51 PM   #1
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Default Jung Super Regulator

Is it possible to turn a negative Jung Super regulator board (such as the one offered by audio express) into a positive board. I thought I read somewhere that it can be done.

Also...I notice that when drawing .5 amps through the regulator, it does not start up with out first disconnecting the regulator from the load then reconnecting to the load. After that, it works fine...nice and quiet...
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Old 7th August 2009, 01:24 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
Jung & co. discuss starting from cold in their paper.
I don't recall a requirement to disconnect the load.
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Old 7th August 2009, 01:34 PM   #3
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IIRC it does depend somewhat on the Vout and the input/output difference. What voltage levels are you using? What kind of diode or zener value in series with the opamp output?

Jan Didden
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Old 7th August 2009, 01:51 PM   #4
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Thanks for your response...

The voltage difference is 16 volts going to 8.9 volts. The Zener is the prescribed Zener in the AOS shematic...I think the IN5235b....


Jan...is there a way to turn a negative board into a positive board??
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Old 7th August 2009, 01:56 PM   #5
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Quote:
Originally posted by audionut
Thanks for your response...

The voltage difference is 16 volts going to 8.9 volts. The Zener is the prescribed Zener in the AOS shematic...I think the IN5235b....


Jan...is there a way to turn a negative board into a positive board??

So your opamp runs on 8.9V supply? Is that OK, what opamp type are you using? A 4.7V zener or thereabouts should auto-start it, biasing the opamp output about mid supply. Have you tried that?

I really don't know whether the neg board can be turned into a pos reg. Since I designed two boards, I guess not - I would have spotted that opportunity to save money for sure. The articles are in my cellar somewhere so I have no immediate access to them. Can't you get a pos board?
At any rate, if you use an isolated secondary and floating rectifier you have a floating supply and you can connect it up anyway you want.

jd
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Old 7th August 2009, 02:07 PM   #6
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I use the two positive regulators in Doede Duama's DDDAC Mark II Dac. The TDA 1543 DAC chips can operate at up to 9 volts, hence the 8.9v setting. One Reg for the 1543 chips, the other reg to supply the rest of the circuits.

Your regulator on the 1543 chips improve the DAC over a battery supply...
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