simple HV rail splitter/floating ground - would this work?
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Rodeodave
hates ground loops
diyAudio Member

Join Date: Dec 2004
Location: in the alps
simple HV rail splitter/floating ground - would this work?

I have an old isolation transformer rated 230V/230V 120VA with single primary/secondary windings.
Now I'm looking for a way to get +/- 150V DC @ 20mA out of it (for a tube EQ with gyrated capacitors).

Will/would the attached circuit work or am I missing something? Should the values of R1 and R2 be lower for better performance?
A simulation of the full circuit (not just with R3/R4 a a load) suggests that the same current is drawn from both rails, so symmetry shouldn't be a problem, theoretically.
Also, would the attached circuit's ground node be a reasonable place for a star ground?

As usual, thanks for reading and replies,

David

Edit: A simulation of the attached circuit doesn't give +/-150V DC as a result, the sim is just short of +/-113V DC...it's just a simulation ...
Attached Images
 hv_rails_split.jpg (35.2 KB, 130 views)
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Gravity - Making the G since 13.7 billion B.C.

 20th July 2008, 03:00 PM #2 sawreyrw   diyAudio Member   Join Date: Apr 2006 Location: Minnesota David, This circuit should work fine, if the load currents are the same. I suspect the reason you got +/1 113 volts out is because the peak of you supply is 230 volts and the RMS value is only 163 volts. Rick
Rodeodave
hates ground loops
diyAudio Member

Join Date: Dec 2004
Location: in the alps
Quote:
 Originally posted by sawreyrw David, ... the peak of you supply is 230 volts and the RMS value is only 163 volts. Rick

Of course

I guess I'll try it then, just have to reform the electrolytic caps and gather some other components before I will actually start building. Good thing is I already have a chassis...

thanks a lot,

dave

Edit: You think I might get away without reforming the caps? They're Epcos 470uF450V and have been in a box for maybe 4 years now (NOS...). Since they'll see only 150V...or is it too high a risk?
__________________
Gravity - Making the G since 13.7 billion B.C.

 20th July 2008, 05:12 PM #4 sawreyrw   diyAudio Member   Join Date: Apr 2006 Location: Minnesota I would recommend you reform them, but I'm not an expert on this.

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