Allo Digione

[astromo]

 

On 4/7/2018 at 2:30 PM, chauphuong said:

On 12/25/2017 at 8:42 PM, allo.com said:

In my opinion DigiOne will not benefit greatly from a ultra low noise PSU.

 

   If you want to try you could try removing the isolated DC/DC convertor and use 2 PSUs to feed the RPI and DigiOne

 

Could you please show how to use a separate PSU to feed DigiOne? I have a LT 1083, and also a 7V Rcore at hand but just don't know what to remove and where to solder on DigiOne.

 

If the manufacturer is not recommending modification of their equipment, by default I'd expect that you'll be on your own and I wouldn't expect them to be overly forthcoming with suggestions. My reasoning is that there's bound to be at least one unreasonable person out there who complains bitterly when an unsanctioned modification goes awry but if some sort of guide (even a very rough one) is provided by the manufacturer, then they've opened themselves up to potential liability claims. The safest thing for Allo is to stick to their line of, "modifications are not recommended and if you do, the warranty is void".

 

Looks like you don't really need to mess with the PSU (as long as the details below were achieved with the Allo standard power supply, or similar) according to this:

https://allo.com/sparky/digione.html

 

Quote

Then we went to work

10 LDOs, 12 LPF, DC/DC convertors, galvanic isolator, WM8805, flip flops, buffers, NDK oscillators.

Optical had to go… by definition it has a jitter of 4ns. That’s 4000ps. We simply removed it. However, optical has galvanic isolation so we took the decision to use a digital isolator instead that separates the outputs from both RPI and WM8805.

DigiOne has 2 outputs: BNC and plain RCA (coaxial). On both, we have achieved jitter of 0.6ps (1 picosecond – time taken by light in a vacuum to travel approximately 0.30 mm).

...

Compatibility

The Digione has a galvanic isolator for both power and signals. You do not need an extra isolator. As well, DigiOne has a double reclocking of the S/PDIF stream (one of them taking care of metastability and the second one taking care of realigning the data). You do not need another reclocker (like Kali).

 

 

 

Apart from certain Dutch reviewers making subjective claims regarding the use of an LPSU, have you got an objective basis to give yourself cause to use an LPSU? Or is it just a case of belt, braces and a piece of string for a waist band?

[astromo]

Or, you could try CRAAP settings.

 

Admittedly for a different platform but the principles could translate across:

http://archimago.blogspot.ca/2017/01/measurements-raspberry-pi-3-as-usb.html?m=1

Archimago "swears by them".