DAC AD1862: Almost THT, I2S input, NOS, R-2R

[EUVL]

No need to build mine. Just use Pedja's. It is FREE.
https://www.diyaudio.com/archive/bl...-out-production-pedja-rogic-ddnf-iv-stage.pdf

And all cheap parts; P2P, no PCBs required.


Cheers,
Patrick

 

[Paddy Garcia]

If one wanted to build yours, could a PCB be had?

 

[EUVL]

If there is sufficient interest, Fran has kindly promised to get things organised.
He will want a PCB set in any case.


Thank you for your interest,
Patrick

 

[nautibuoy]

If it helps to get a group buy rolling I'll sign-up to a PCB set.

 

[woodturner-fran]

If we get one or two more members interested (why wouldn't anyone with this DAC be interested!) I can open a group buy thread.

Please post here to show initial interest.

Thanks

Fran

 

[EUVL]

> why wouldn't anyone with this DAC be interested!

Because it is not FREE !

🙂


Cheers,
Patrick

 

[Vunce]

I’m in!! 😀
Thanks Fellas.

 

[woodturner-fran]

You can't make an omelette without breaking eggs


Like most people, I also always look for a best value way to do something - but sometimes when I see something that might cost a bit more I think, I am going to enjoy the sound this thing makes for years to come. Now the extra 10e I spend on regulators, or the 30e on a transformer seems very cheap when I spread that over the next 10 years.

Fran

 

[nautibuoy]

BTW, are we talking about bare boards or populated?

 

[diyiggy]

If one wanted to build yours, could a PCB be had?

Notice it has be already made with P. Rogic design in the Painkiller ad1862 thread.


But again you can avoid the selecting parts matching by just using a good transimpedance oap like the op861, but here it would be better to do it on the same pcb as it's high speed enough soic part... it doesn't really need a buffer as well if your pre has high sensivity enough.


As Jean-Paul stated out elswhere in Patrick's thread linked above : it's almost a discrete part and can be seen as a single transistor.

 

[EUVL]

> it's almost a discrete part and can be seen as a single transistor.

Then why not just use a single transistor ? 😉


Patrick

 

[diyiggy]

.... as said J-P... we are in the Twilight-zone here 😉 ... it's ant with more than three legs !

 

[EUVL]

> BTW, are we talking about bare boards or populated?

This is a DIY forum, right ? 😉

If you have read the pdf description, you already know that the transistors need hfe matching for best results.
I am 100% positive you do not want to pay my hours.

So yes, bare boards, 2 pairs (left & right versions) for 2 channel balanced, plus one spare for test build beforehand.
No matching regulator boards; these are too difficult to hand solder, even for me.
So you can better get commercial ones (recommend to use LT3045/3094 12V).


Patrick

 

[eziitis]

If we get one or two more members interested (why wouldn't anyone with this DAC be interested!) I can open a group buy thread.

Please post here to show initial interest.

Thanks

Fran

Great! Count me in please.

 

[nautibuoy]

This is a DIY forum, right ? 😉

Perhaps I was going to make an offer to get some matched/assembled, like I did with the Valve DAC GB?

Also, I had half assumed that they might be pre-assembled because of them not being free and as part of you protecting your IPR?

 

[EUVL]

Fran will get a BoM.
Whether he or one of his friends will offer matching is up to him.
Anyone with a bit of searching and studying will figure out all the circuit values anyhow.
I posted enough photos.


Cheers,
Patrick

 

[EUVL]

Since we are discussing the OPA861, here is a simplified schematics of its predecessor, the OPA660.
You can decide for yourself whether it is a discrete part or integrated circuit, like the BUF634.


Cheers,
Patrick

.

 

[diyiggy]

has someone said it was a discrete ?

 

[nautibuoy]

Fran will get a BoM.

Any chance of a solder stencil too - smd soldering in a reflow oven makes life so much easier and improves the odds of a successful outcome.

 

[Ripster]

I’m in for a group buy!!! 😀