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

You can't make an omelette without breaking eggs :nod:


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
 
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.
 
> 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
 
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

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