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

[diyiggy]

What I am going to do, is: start with one psu2, both set to +-5V. Later then switch back to +-5V and +-12V and add a separate+5V for digital part of AD1865 and I will see, if the effort is pays. Cheers

Then you cqn try pure Jfet with op1678... seems a good candidate. However a dual. Will be ok with Vunce adaptator without dil8 wocket , solder caps leads surplus direct on the adaptator.

 

[mikorist]

Yes, so you have a jittery and not synchronised souce, and you clean it up with cmplicated software / firmware / hardware.
Is that a good solution ? Are there no better solutions ?


Patrick

Yeah PCI - USB cards with low jitter TCXO crystals are up to 500 euros

There is no a motherboard that has USB built-in TCXO of this precision ...

 

[ernesternest]

.... solder caps leads surplus direct on the adaptator.

Good idea, even for normal adapter.

 

[diyiggy]

"adapter"... sorry.
Made with some UKZ leads 100V : https://www.diyaudio.com/community/...st-tht-i2s-input-nos-r-2r.354078/post-7021918. Easy to take the good diameter when you have tons of caps...ahaha !

 

[mikorist]

I/V opamps can be powered separately. Don't install J10, J11, J12 and J13. Use these pins for the +-12V PSU:

(+-5V still be needed for the AD1865)

I think there is another cheaper solution

Don't install J1 and J2. Use these pins for the +-5V PSU

Below the connector where it says VA becomes + 12 / -12V

Capacitors C27, C28, C32, C33 change to be 100uF / 16V

 

[miro1360]

@mikorist Very good catch

 

[chi0001]

For the best sound experience avoid direct I2S output from the rpi. Instead use the rpi USB and connect here a high quality USB-I2S device with clean clock (like jlsounds or another xmos based ... I think even the cheap PCM2706 with rpi USB will sound better as direct I2S from the rpi) ... someone in this thread tried it ...
In the future I can create 40 pins version also for RPI, but it will be the stop-clock

great.

 

[skrstic]

Recap:
v1. - 1 PSU board (+5, 0, -5 and +12, 0, -12)
v2. - 1 PSU board (+5, 0, -5 and +12, 0, -12) + 1 PSU board (+5, 0)

miro1360 please confirm.

 

[bohrok2610]

Yes, so you have a jittery and not synchronised souce, and you clean it up with cmplicated software / firmware / hardware.
Is that a good solution ? Are there no better solutions ?

Well implemented USB-I2S bridges have separate clock domains for source and DAC. So I2S timings are generated from the same MCK which DAC uses. If the USB-I2S bridge operates with asynchronous (or adaptive) UAC source jitter should have no impact.

 

[surajspai]

Would anyone have any AD1862 PCBs and power supply boards to spare?

 

[jimk04]

I have DAC and PSU1 spare.

 

[batteryman]

i found four new unused (still in tube) AD1862 if anyone wants to make me an offer. (bought from Rochester a few years ago i think)

Also two AD1865 - used.

 

[batteryman]

Would anyone have any AD1862 PCBs and power supply boards to spare?

I have one bare AD1862 DAC pcb with onboard FIFO.
It's this one, without dac and Xmos.

https://www.diyinhk.com/shop/audio-...fo-reclock.html#/dac-dac_pcb_without_dac_chip

I also have four AD1862

 

[batteryman]

All items in this thread in the Swap Meet forum.

https://www.diyaudio.com/community/threads/ad1862-1865-dac-pcb.387068/

 

[miro1360]

Recap:
v1. - 1 PSU board (+5, 0, -5 and +12, 0, -12)
v2. - 1 PSU board (+5, 0, -5 and +12, 0, -12) + 1 PSU board (+5, 0)

miro1360 please confirm.

Use v2

 

[chi0001]

And Sparkos voltage is minimum +-6V
View attachment 1062440

So whoever tried Sparkos at AD1865 PCB - didn't hear how Sparkos really works ...

it works with +/-5v, sound beautiful, dont want to put it out, i will try +/-12v later.

 

[commstech]

it works with +/-5v, sound beautiful, dont want to put it out, i will try +/-12v later. View attachment 1063103

what discrete op amp modules are these?

 

[jimk04]

Sparkos?

 

[chi0001]

ss3601.

 

[mikorist]

ss3601.

I have to go at least +-10V - since I listen them directly to headphones. Although +-9V is the optimum for Sparkos from datasheet.
I've never tried it with + -12, I don't know how much it will heat up.