Diamante -a discrete medium power opamp

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#103
A hint Russ:
It is a good idea to have the same revision on the pcb as in the schematic or at least write in the schematic which pcb layout that fits. I work at Ericsson and they have a revision system that is "a bit" over yours :nod:

Think this: I'll pick up a pcb of your and want to grab the corresponding schematic without any hesitation.
 
#104
peranders said:
A hint Russ:
It is a good idea to have the same revision on the pcb as in the schematic or at least write in the schematic which pcb layout that fits. I work at Ericsson and they have a revision system that is "a bit" over yours :nod:

Think this: I'll pick up a pcb of your and want to grab the corresponding schematic without any hesitation.
Click to expand...

Hah P.A. you are so hard to please. 😉

Keep in mind this board was done just as a favor not a production thing for me. 🙂

Still if this makes you feel better:

gerbers

Now it should be clear it is the 1.1 circuit and REV 1 of the double side DIY layout.



Cheers!
Russ
 
#105
Russ White said:
Hah P.A. you are so hard to please. 😉
Click to expand...
I'm not particulary displeased but I see a potential problem mainly for you, getting unnecessary questions.

Compare this: A project here lacks of a reference wiring schematic/picture. How many questions have we got about hum and offset problems? What would happen if this project had in the manual with clear instructions about this? I'm sure you all know what project I mean. :nod:
 
#114
Forgive me in advance if I am incorrect?

But, merely having opposite polarity transistors connected to opposite power supply rails does not make a cross-coupled buffer... perhaps in that few second look at the schematic I missed something crucial.

Doesn't make it a bad circuit though...

_-_-bear
 
#115
bear said:
Forgive me in advance if I am incorrect?

But, merely having opposite polarity transistors connected to opposite power supply rails does not make a cross-coupled buffer... perhaps in that few second look at the schematic I missed something crucial.

Doesn't make it a bad circuit though...

_-_-bear
Click to expand...

I have no idea what you are trying to get at. 🙂

It's a typical diamond buffer output stage.

Cheers!
Russ
 
#116
Wherein the x-coupling involves feedback from the output stage back to the input stage via the "cross coupling"... the whole thing following its collective tail, that being a unity gain buffer. Perhaps this isn't the same thing as the "diamond buffer" idea. Or perhaps this sort of thing has been discredited measurement wise, or in terms of listening? Not to worry, I am easily distracted and confused! 😀

regards,

_-_-bear
 
#117
This isn't my circuit, it is from John Broskie's site, but it contains elements of what I was attempting to reference in my post... (hope it shows up when I post...)

regards,

_-_-
 

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#119
...what about without the two 100 ohm resistors that are between the two upper transistors and the bottom two transistors... the horizontal ones, and assume the outputs to be flipped, as is the stage before, emitter to the output... of course that is a differnt circuit, but it is the idea I'm aiming at...


_-_-bear

edit 3: I noticed a simplified version of what I use is mentioned in post 3 here: http://www.diyaudio.com/forums/showthread.php?s=&threadid=125378&perpage=35&pagenumber=1
 
#120
I have now started to populate two of the boards. Of course, I now realize that I dont have a +-15V psu at hand :bawling:

I was hoping that the two swedish guys that showed interest in the boards would chime in, because someone needs to try these boards out before any groupbuy can take place.
 
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