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Old 13th September 2011, 05:59 PM   #151
EUVL is offline EUVL  Europe
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The floating supply does not float more than the output across R_iv.

So if you are not afraid of twisted wires at the output, you should not be afraid of any capacitance of the supply lines to Gnd.

In the test PCB we measured at Jan Didden's, we did not paid any attention to wiring and have them all over the place.
Yet the performance is there for all to see.


Patrick
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Old 13th September 2011, 06:02 PM   #152
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If you don't like using floating supplies (I use them for circlotrons all the time) and insists on using fixed rails,
you can build the CEN Current Mirror circuit, with 10 transistors in total, higher noise and distortions.

Easy enough to modify my published PCB layout and make one yourself.

As said, Joachim's idea. So no PCBs from us for the CEN CM.


Patrick
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Old 13th September 2011, 06:48 PM   #153
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I showed a mirror with approximately the same amount of distortion as your circuits. The noise issue can be solved too with cascoding but then it is not simple any more.
I agree that a floating supply is not a problem to make. The easiest are buffered batteries or accumulators.
Somewhere in my files i have a design for a floating low noise supply that can be fed by a conventional mains transformer. When i can dig it up i will publish it if you like.
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Old 13th September 2011, 06:51 PM   #154
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> The easiest are buffered batteries or accumulators.

That was what I used at Jan's place.

> When i can dig it up i will publish it if you like.

Please. 100%.
I think many others would be interested also.


Patrick
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Old 13th September 2011, 07:37 PM   #155
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Hello Patrick,
I red your posts about high current Dacs like ES9018, and I'd like to know if you can sell also Sen or CEn with more pairs of Jfets?
Thanks
Guglielmo
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Old 13th September 2011, 07:56 PM   #156
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>Somewhere in my files i have a design for a floating low noise supply that can be fed by a conventional mains transformer.

... very interested, indeed!
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Old 13th September 2011, 08:02 PM   #157
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2 Pairs of 2SK170/2SJ74 or 2 pairs of 2SK369V is AFAIK sufficient for ES9018.
This is already supported by the current PCBs.


Patrick
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Old 13th September 2011, 08:05 PM   #158
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For the basic principle something as old as me.
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Old 13th September 2011, 10:17 PM   #159
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Quote:
Originally Posted by Joachim Gerhard View Post
For the basic principle something as old as me.
Or using a few more parts.
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File Type: gif FlyingCap PS sch.gif (33.5 KB, 961 views)
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Old 13th September 2011, 11:01 PM   #160
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Quote:
Originally Posted by stinius View Post
Or using a few more parts.
Interesting.

The circuit on the left would not be covered by U.S. Patent 2,895,059 because it doesn't have the dummy load and does not use the center tap as ground. However, the circuit on the left is the one that I would intuitively build.

The circuit on the right does indeed look like an actively regulated version of 2,895,059 because there appears to be a dummy load (active, at that) and ground is taken from the center tap like in the patent. ... EDIT: Oops, that's not a dummy load. The circuit on the right is also not similar to the patent mentioned above.

Both examples would have leakage current to ground which patent 2,895,059 minimizes with its dummy load.

Last edited by rsdio; 13th September 2011 at 11:04 PM.
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