So... Thanks to Mr Slim aka John I got some boards from his GB.
Now sourcing parts, Ad1862 already arrived from China in the hope they are the real deal.
So I am looking for a recommendation for OpAmps with a controlled and less prominent bass reproduction as my good old IMF TLS80 are a little bit too much in my smallish room, hence I prefer that kind of OpAmps. Normally I prefer discrete circuits or transformers, but then it is so convenient to pop in different ones to change something.
Will be interesting to compare to my Soekris 1121, which finally sounds really good after some tweaking here and there.
Ah, and has the 47/4,7uf combo to be super low esr? I have some nice NOS 47uf Siemens LL caps around, together with some 4,7uf wet tantalum.
Very curious for that dac...
Now sourcing parts, Ad1862 already arrived from China in the hope they are the real deal.
So I am looking for a recommendation for OpAmps with a controlled and less prominent bass reproduction as my good old IMF TLS80 are a little bit too much in my smallish room, hence I prefer that kind of OpAmps. Normally I prefer discrete circuits or transformers, but then it is so convenient to pop in different ones to change something.
Will be interesting to compare to my Soekris 1121, which finally sounds really good after some tweaking here and there.
Ah, and has the 47/4,7uf combo to be super low esr? I have some nice NOS 47uf Siemens LL caps around, together with some 4,7uf wet tantalum.
Very curious for that dac...
Well you will see these discrete RTWOR RRRRRs' have nothing special but the hype and of course the facility to tweak the filters !
As always powersupplies and details from Evil & corp matter !
It has really nothing to see with discrete but more the global layout choices imho !
Can one seriously believe some already made better in the diy world than these Ad1862, TDA1541A, AD1865, PCM58,63... let me joke twice !
As always powersupplies and details from Evil & corp matter !
It has really nothing to see with discrete but more the global layout choices imho !
Can one seriously believe some already made better in the diy world than these Ad1862, TDA1541A, AD1865, PCM58,63... let me joke twice !
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I am not quite getting what you are talking about but when I mentioned discrete I meant something like the Zen circuit, or other buffer or I/V stages built not with OpAmps.
I believed you were talking about discrete dac as some hyped R2R as the one you mention that make more noise than music due to their whole design 🙁 !
I received my PCBs. Now I have to wait for AD1862 chips and other stuf... Thanks Miro for this free great design.
Need help in a simple I2S dac to feed this AD1862 dac. I read somewhere that this XMOS dac should be suitable and I will be using it with a Raspberry Pi - XMOS XU208 Asynchronous USB Digital Interface Coaxial DSDOP IIS Output DSD128 | eBay
I hope I can use its I2S output to feed to this dac and it has the option of externally powering via 5vdc.
Thanks
I hope I can use its I2S output to feed to this dac and it has the option of externally powering via 5vdc.
Thanks
@Ripster perfect 🙂
@manniraj you can use any standard I2S source
if you buy this xmos based from ebay, ask the seller for a signed driver (windows), don't buy it if he offers you an unsigned free driver (free from thesycon) and better look for other sellers with a signed windows driver
@manniraj you can use any standard I2S source
if you buy this xmos based from ebay, ask the seller for a signed driver (windows), don't buy it if he offers you an unsigned free driver (free from thesycon) and better look for other sellers with a signed windows driver
Thanks Miro, but if I am not using a Windows PC does it still makes a difference as on a Mac/Linux (presuming Pi) works without any driver support?
Love the black boards Ripster!
In my case, I can’t order in black because the traces are very difficult to see
Good luck with your build!!
@Miro, a quick question on the initial setup of the DAC.
I have removed all the ICs and powered it up with +/-12vdc and +/-5vdc then tested all the test points for the voltage and everything perfect. Later I put the ICs back to to board and checking the offset voltage of the outputs and I am getting -1.513vdc on the left channel and 0.562vdc on the right channel. I have the RC filter on the board and also the pair of trimmers. What should be the ideal voltage on the output and can I set this using the trimmers?
thanks
I have removed all the ICs and powered it up with +/-12vdc and +/-5vdc then tested all the test points for the voltage and everything perfect. Later I put the ICs back to to board and checking the offset voltage of the outputs and I am getting -1.513vdc on the left channel and 0.562vdc on the right channel. I have the RC filter on the board and also the pair of trimmers. What should be the ideal voltage on the output and can I set this using the trimmers?
thanks
@manniraj
remove the RC filter (not needed, don't put it there at all) and remove trimmers (they are not for offset)
... measure the offset (it should be a few mV)
remove the RC filter (not needed, don't put it there at all) and remove trimmers (they are not for offset)
... measure the offset (it should be a few mV)
Ok as you suggested remove both the trimmers and also the RC filters R10/11 and C37/38 and now the offset is pretty stable at 0.01mV on both the channels 🙂
I have a spare old raspberry pi2 for the I2S as of now, will use its I2S output to test the dac. Thanks Miro.