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Old 14th February 2009, 11:05 PM   #1
Gluca is offline Gluca  Italy
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Default Problems with a Jung regulator

Folks,

I need to build a pair of Jungs regulator (positive V and negative V) for my DAC but I am having problems with the spice simulations I am running before the soldering the proto. I will use OPA37 and not LT1115 (I had no model for the BB opamp).

The positive reg seems to be OK:
R3 is a 1K pot and I can set the output voltage down to +12V (larger value will allow to go down to the minimum possible set by the zener). R7 represent the load.

pos reg

The negative reg doesn't work. SOOB. I am quite a newbie with solid state. I can't find out whats wrong there.

neg reg


Thanks
Gianluca
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Old 15th February 2009, 02:24 PM   #2
mjf is offline mjf  Austria
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hello.
perhaps try r2-r3 connect to the negative rails (and not to ground).
greetings..............
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Old 15th February 2009, 04:10 PM   #3
Gluca is offline Gluca  Italy
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Hum ... no. That would not work. The circuit seems to regulate with no problem if the zener is connected (via the R4 resistor) before the mosfet drain (ie at the raw supply).

Thanks
Gianluca
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Old 15th February 2009, 09:00 PM   #4
mjf is offline mjf  Austria
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hello.
perhaps reverse the polarity of the signalgenerator.......
and/or sine(-35 1 10).
greetings...............
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Old 19th February 2009, 01:40 PM   #5
nvshier is offline nvshier  China
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connect a 10k resistor between S and D of IRF
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