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Virtual Ground (regulated!) - and Rail Splitter Circuits! - Page 9

post #121 of 125

Hello, I lift the old topic. I would prefer to assemble this Rail Splitter because ""rock solid" virtual ground". However, there is a little offset of zero potential, -17.8 vs 18.2.  Unfortunately under load(300-500ma) i have a no little  skewness of voltage, like -17.3 vs 18.7. Vin 36v, r1-r2 6.8k or perfect 8 - no matter.  What can be wrong? I have attached a diagram, but the error did not find it ...

http://imgur.com/EeqOYR1

post #122 of 125

Hello, I lift the old topic. I would prefer to assemble this Rail Splitter because ""rock solid" virtual ground". However, there is a little offset of zero potential, -17.8 vs 18.2.  Unfortunately under load(300-500ma) i have a no little  skewness of voltage, like -17.3 vs 18.7. Vin 36v, r1-r2 6.8k or perfect 8 - no matter.  What can be wrong? I have attached a diagram, but the error did not find it ...

post #123 of 125

You can trim the voltage up or down by introducing a trimpot in either R1 or R2 (of course reducing the value of the appropriate resistor accordingly).

This circuit does work but nowhere near as elegantly as Wakibaki's contribution to this old thread. His circuit is cleaner and rather better sonically. 

post #124 of 125

Please take a look to
http://www.diyaudio.com/forums/headphone-systems/304015-better-railsplitter-virtual-ground.html

 

Two options about railspiltter
.

 

.
What are the better way?

post #125 of 125
Quote:
Originally Posted by Ahimgeon View Post

Hello, I lift the old topic. I would prefer to assemble this Rail Splitter because ""rock solid" virtual ground". However, there is a little offset of zero potential, -17.8 vs 18.2.  Unfortunately under load(300-500ma) i have a no little  skewness of voltage, like -17.3 vs 18.7. Vin 36v, r1-r2 6.8k or perfect 8 - no matter.  What can be wrong? I have attached a diagram, but the error did not find it ...



http://imgur.com/EeqOYR1


 



Double check you've got the LM336 the right way around.

I've built the full version with the 1085 - held the rails very tightly with less than 1/10th of a volt difference IIRC - seemed to work well but since I've either used a TLE2426 with op amp ground buffer or DCP DC-DC POL (dual output) w/ LM317/337 regs.
Edited by Rroff - 3/22/17 at 10:15am
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