I have most of the parts to stuff the boards. And four boards. Nick gave me the boards. If someone will build these I will give you a real deal on the surface mount components.
My surface mount skills are poor. I doubt I would ended up with two working channels if I stuffed all four.
Nick was extremely generous in sending four boards. Wish I had built them.
My surface mount skills are poor. I doubt I would ended up with two working channels if I stuffed all four.
Nick was extremely generous in sending four boards. Wish I had built them.
Deep null
The amp used deep correction to lower THD. The circuit was fairly complex. Not sure if this was what he was referring to.
Nick did a lot of modeling and then actual testing. Seemed solid.
The amp used deep correction to lower THD. The circuit was fairly complex. Not sure if this was what he was referring to.
Nick did a lot of modeling and then actual testing. Seemed solid.
I just looked at the site. It is not a current source output, but does have some detail LS like Mauro Penasa’s My_Ref.
The plots look good, but cannot read the text.
If anyone wants to build I have four boards and a bag of parts. The amount and sizes of surface mount parts stopped the stuffing of the boards. I know my poor SM soldering skills would eat me up.
The plots look good, but cannot read the text.
If anyone wants to build I have four boards and a bag of parts. The amount and sizes of surface mount parts stopped the stuffing of the boards. I know my poor SM soldering skills would eat me up.
If anybody would like to reproduce it here is a nice GitHub page GitHub - diyaudioby/amp-lm3886-zd-50: Top lm3886 amplifier (4 layer board)
Yes, you can see photos in the link I posted above. This is a popular amp on that forum.
For example, my variant of old but simple "Revision A":
????????? ???????? ZD-50 - ???????? 238
And my variant as part of the media player:
?????????, ??? ? ????????? NEO
Hey nick Im interested in documentation but... unfortunatly.. the s-audio site admin has blocked the new member registration. Can you attatch here? Thanks
Has someone built this amp?
I put it on LTSPICE, and it seems to be not correct. Please see Mr. Evil post of the original schematics.
In the first picture, X2 in- gets feedback from its own output and from the output of the main OP. But in the 2nd picture, in- of LT1363 only gets only the feedback from LM3886, but not from its own output.
I put it on LTSPICE, and it seems to be not correct. Please see Mr. Evil post of the original schematics.
In the first picture, X2 in- gets feedback from its own output and from the output of the main OP. But in the 2nd picture, in- of LT1363 only gets only the feedback from LM3886, but not from its own output.
Attachments
I suggest adding a resistor from the input to ground to give the LT1363 a DC path to ground for the input bias current to flow.
The LT1363 does have local feedback through the capacitors, just no feedback at DC.
Tom
The LT1363 does have local feedback through the capacitors, just no feedback at DC.
Tom
The simulation of my final version RD-50.
After I simplified it, I found out there was a same version published in 2019.
in the sim, I used AD711 instead of LM3886, because it looks like LN3886 on the spec.
I also used LT1028 in the place of LM3886 because of its open gain phase curve in sim matches LM3886 on the paper nicely.
After I simplified it, I found out there was a same version published in 2019.
in the sim, I used AD711 instead of LM3886, because it looks like LN3886 on the spec.
I also used LT1028 in the place of LM3886 because of its open gain phase curve in sim matches LM3886 on the paper nicely.
