BAL to UNBAL DAC buffer

revintage · 29th January 2010, 05:38 AM

Kind of instrumentation amp. Any clues if the good simmed results are valid IRL?

revintage · 29th January 2010, 06:11 AM

Oooops

!

Wrong picture, should be this one:

Zen Mod · 29th January 2010, 06:24 AM

why not?

but - maybe it's better as full SUSY - having NFB on both sides

revintage · 29th January 2010, 06:30 AM

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.

Franz Gysi · 29th January 2010, 06:37 AM

Supersymetry

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

Franz

revintage · 07:39 AM

Quote:

Originally Posted by Franz Gysi

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.

analog_sa · 29th January 2010, 07:29 AM

Quote:

Originally Posted by revintage

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?

poynton · 29th January 2010, 07:34 AM

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

.

revintage · 08:05 AM

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?

poynton · 29th January 2010, 08:12 AM

Quote:

Originally Posted by revintage

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

.

29th January 2010, 06:24 AM	#3
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	why not? but - maybe it's better as full SUSY - having NFB on both sides __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

29th January 2010, 06:30 AM	#4
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	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. __________________ Brgds Lars

29th January 2010, 07:34 AM	#8
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	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 . __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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29th January 2010, 06:37 AM	#5
Franz Gysi diyAudio Member Join Date: Oct 2007	Supersymetry BTW: I miss the grid resistors (grid to ground). Franz

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