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Old 29th January 2010, 05:38 AM   #1
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Default BAL to UNBAL DAC buffer

Kind of instrumentation amp. Any clues if the good simmed results are valid IRL?
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Old 29th January 2010, 06:11 AM   #2
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Oooops!

Wrong picture, should be this one:
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Old 29th January 2010, 06:24 AM   #3
Zen Mod is offline Zen Mod  Serbia
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why not?

but - maybe it's better as full SUSY - having NFB on both sides
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Old 29th January 2010, 06:30 AM   #4
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Hey Zen Mod,
Must find out what a "full Suzy" is.

Found an error, R10 should not be DC-connected to ground. Cap should be added in series.
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Old 29th January 2010, 06:37 AM   #5
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Supersymetry

BTW: I miss the grid resistors (grid to ground).

Franz
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Old 29th January 2010, 07:20 AM   #6
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Quote:
Originally Posted by Franz Gysi View Post
Supersymetry

BTW: I miss the grid resistors (grid to ground).

Franz
Hey Franz,
Yep I know of Pass Suzy(even not in detail), just couldn´t figure out how Zen Mod wanted to apply it here.

About the gridresistors, none are needed as the DAC is DC-connected and bias the grids to +2,5V. With over 5V on the cathodes no negative supply should be needed for the CCS.

Last edited by revintage; 29th January 2010 at 07:39 AM.
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Old 29th January 2010, 07:29 AM   #7
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Quote:
Originally Posted by revintage View Post
With over 5V on the cathodes no negative supply should be needed for the CCS.

Maybe not for the ones with an arrow inside a circle Who makes them?
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Old 29th January 2010, 07:34 AM   #8
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Yes, it will work.

I used a similar circuit on my CD63 a couple of years ago.
( It's on the huge thread somewhere....)

I used E88CC at an anode voltage of 30v


Andy


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Old 29th January 2010, 07:42 AM   #9
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Quote:
Maybe not for the ones with an arrow inside a circle Who makes them?
Will also work with a single BJT CCS. With over 5V DC and a signal of under 1V no problems will occur.

Quote:
I used a similar circuit on my CD63
Finally found your amp and found it farfetched to call ours alike. But sure, you used two triodes and took the output signal from one of them. Maybe you changed the circuitry later in the thread as the one I found looked rather basic. Can you show it again?

Last edited by revintage; 29th January 2010 at 08:05 AM.
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Old 29th January 2010, 08:12 AM   #10
poynton is offline poynton  United Kingdom
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Quote:
Originally Posted by revintage View Post
Will also work with a single BJT CCS. With over 5V DC and a signal of under 1V no problems will occur.



Finally found your amp and found it farfetched to call ours alike. But sure, you used two triodes and took the output signal from one of them. Maybe you changed the circuitry later in the thread as the one I found looked rather basic. Can you show it again?
Yes, the diagram on the thread is basic, to say the least !!

The input was modified from T-L's published circuits and the triode stage was better developed, of course.

Sorry, I can't be more explicit at the moment ... most of my stuff and the final stage is in storage.


Andy


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