I have to repeat the question, can I take the PCM1702 on the PCM63 adapter and try it in the Miro PCM63 DAC?
The voltages are the same, and everything else about the arrangement of pins and other things is solved by the adapter. The output current is lower, +-1.2mA, that can be solved by a higher value I/V resistor (2k4).
https://www.ebay.com/itm/114733849734
There are also adapters for SMD versions of the PCM1702.
https://www.ebay.com/itm/121089795739?hash=item1c3183a69b:g:FU0AAOxy14VRWxQk&amdata=enc:AQAHAAAAsNEsJGQd1y/e6SO6zxIpssij0NHf0+TyyFvPNlVPOmOrbf5KmQ+lmAqwNtCBff2YZPN85lszZzA4SsOz1bcOESJu9UavB62pEKugX0VqR/fnhbz9+hBKDBwrhIgjkCXI0TnalW3ur3fRxy98Do2L95UjJoibWBZNosiaj3RbyiJFvIG5taLL8DNcFxb/kcHHDwrQrkL2ZG5yYG91o5ettPmiSiUAgPZWAK/1SDOiCtXY|tkp:Bk9SR6zF64CdYQ
Also the PCM1702 is cheap.
https://www.ebay.com/itm/362255965866?hash=item5458235eaa:g:kTQAAOSw7FRWWXRM
https://www.ebay.com/itm/362255959332
https://www.ebay.com/itm/114733849734
There are also adapters for SMD versions of the PCM1702.
https://www.ebay.com/itm/121089795739?hash=item1c3183a69b:g:FU0AAOxy14VRWxQk&amdata=enc:AQAHAAAAsNEsJGQd1y/e6SO6zxIpssij0NHf0+TyyFvPNlVPOmOrbf5KmQ+lmAqwNtCBff2YZPN85lszZzA4SsOz1bcOESJu9UavB62pEKugX0VqR/fnhbz9+hBKDBwrhIgjkCXI0TnalW3ur3fRxy98Do2L95UjJoibWBZNosiaj3RbyiJFvIG5taLL8DNcFxb/kcHHDwrQrkL2ZG5yYG91o5ettPmiSiUAgPZWAK/1SDOiCtXY|tkp:Bk9SR6zF64CdYQ
Also the PCM1702 is cheap.
https://www.ebay.com/itm/362255965866?hash=item5458235eaa:g:kTQAAOSw7FRWWXRM
https://www.ebay.com/itm/362255959332
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10 years on the scene and so far only ecdesign dominated here with his i2s-to-simultaneous logic? 😊
Really, I don't have schematic of his work. You can find or ask him for it, compare and look for differences. Without a diagram it is difficult to compare anything 🙂
Hit play and then stop, and try trim while the music is stopped 😉
I think you can. +-5V for both, this adapter has the capacitor for PCM1702, both are 20-bit, there is nothing that is not compatible 🤔
The only problem I see is the PCM1702 in the SMD version. I bought it from ebay in the past, along with the PCM1704, and none of them worked, they were all damaged. Recycling center "carefully" destroyed them under the removing process with the heatgun set to full power 🤣 I also had a damaged PCM1702 in DIP case, and I also have a functional one. ebay is a mystery box in this 🤣
PSU 3 for AD1862 DAC
or another R-2R DAC
It is a simple fully discrete power supply, "zener diode transistor voltage regulator", which can be modified and tuned.
I've had it ready for a long time, but I still haven't found the time to test it == please take it as untested and don't be mad if it doesn't work 😊
The output voltage value may change slightly after warm-up.
I'm not sure how the heatsinks will perform (don't use it to power anything else, just the AD1862 DAC with I/V).
Once again, keep in mind that this is an experimental PSU, therefore some values may need to be fine-tuned.
BOM example: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=aac15ab52d
or another R-2R DAC
It is a simple fully discrete power supply, "zener diode transistor voltage regulator", which can be modified and tuned.
I've had it ready for a long time, but I still haven't found the time to test it == please take it as untested and don't be mad if it doesn't work 😊
The output voltage value may change slightly after warm-up.
I'm not sure how the heatsinks will perform (don't use it to power anything else, just the AD1862 DAC with I/V).
Once again, keep in mind that this is an experimental PSU, therefore some values may need to be fine-tuned.
BOM example: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=aac15ab52d
Attachments
Thank you Miro. If I ever get a PCM1702, I'll make sure to get new unused ones.
I think my buddy has a few PCM1702 if he hasn't used them or sold them. I know he still has a few AD1862, but no one I know has built a Miro DAC with an AD1862. Maybe just try it with PCM1702 to hear the difference compared to PCM63. Adapters are cheap.
The AD1862 is a functional replacement for the PCM1702 but also for PCM63P
PCM63K is PCM1702 in PCM63 case.
The PCM63P has two of its 28 pins for internal feedback circuitry, while the PCM1702 does not...
It literally doesn't matter which chip it is.. AD1862 or PCM1702 or PCM63P.....
But the rest of the parts on the DAC PCB - and what's in front -I2SoverUSB v.III ....
And it's more important what's on the analog output, how it plays 🤣
Hey guys,
have you tried Sparkos or Muses02 oamps with the DAC?
Did you hear any improvements?
Does it worth to upgrade to one of these regarding the price?
have you tried Sparkos or Muses02 oamps with the DAC?
Did you hear any improvements?
Does it worth to upgrade to one of these regarding the price?
I tried the Sparkos, I found it to be a clear upgrade over a bunch of opamps that I tried.
I forgot to ask. Is it some kind of integrated reference because there aren't many of them with such low noise or some discrete circuit like e.g. Two (or 2.5) Easily Constructed High Performance Audio Voltage References
It is not true that there is no difference between AD1862, PCM63 and PCM1702 as there are differences in performance in their DSs.
One important thing everyone forgets, power supply and regulation, I've been working only on that in my DAC for the last couple of years and it really has an impact on the sound, regardless of whether it's the digital or analog part of the DAC.