Problems with a Jung regulator

Gluca · 14th February 2009, 11:05 PM

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

mjf · 15th February 2009, 02:24 PM

hello.
perhaps try r2-r3 connect to the negative rails (and not to ground).
greetings..............

Gluca · 15th February 2009, 04:10 PM

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

mjf · 15th February 2009, 09:00 PM

hello.
perhaps reverse the polarity of the signalgenerator.......
and/or sine(-35 1 10).
greetings...............

nvshier · 19th February 2009, 01:40 PM

connect a 10k resistor between S and D of IRF

14th February 2009, 11:05 PM	#1
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	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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15th February 2009, 02:24 PM	#2
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. perhaps try r2-r3 connect to the negative rails (and not to ground). greetings..............

15th February 2009, 04:10 PM	#3
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	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

15th February 2009, 09:00 PM	#4
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. perhaps reverse the polarity of the signalgenerator....... and/or sine(-35 1 10). greetings...............

19th February 2009, 01:40 PM	#5
nvshier diyAudio Member Join Date: Feb 2009	connect a 10k resistor between S and D of IRF

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