New Posts New Posts RSS Feed - How simple can an audio computer be?
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Welcome to the Graham Slee Audio Products Owners Club

 

Open to all owners plus those contemplating the purchase of a Graham Slee audio product wishing to use our loaner program: join here
Subscribe to our newsletter here (Rules on posting can be found here)


How simple can an audio computer be?

 Post Reply Post Reply Page  123 47>
Author
Ash View Drop Down
Senior Member
Senior Member
Avatar

Joined: 18 Mar 2013
Location: Dorset
Status: Offline
Points: 3458
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Topic: How simple can an audio computer be?
    Posted: 05 Apr 2021 at 7:23pm
Question... Reckon I could use my motherboard S/PDIF header bracket as a coaxial to optical converter? My Pink Faun card is dual coaxial output so imagine if I could convert one connection to optical so I have the option of either. The SPDIF pin of the three pin header would normally take the electrical signal from the motherboard to both types of digital output simultaneously meaning they are joined to each other by a continuous track. The +5V and GND pins would allow use of a 5V linear power supply to power the LED. There are a few small components on the board that I assume are resistors. As long as there are no diodes or transistors in the SPDIF path, there should be no bias or directionality so I can connect the coax out as a coax in?

Edited by Ash - 05 Apr 2021 at 9:37pm
Lautus S/PDIF>Majestic>Lautus-R3>2xProprius>MySphere 3.1
Back to Top
Ash View Drop Down
Senior Member
Senior Member
Avatar

Joined: 18 Mar 2013
Location: Dorset
Status: Offline
Points: 3458
Post Options Post Options   Thanks (1) Thanks(1)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar 2021 at 7:19am
I have given Raspberry Pi based systems much consideration over the last year. I was originally set on the USBridge Signature (Pi 3B+ CM) with the DigiOne Signature HAT and Graham's DAK 5V 3A power supply. However, I did not want to invest lots of money into a computer that is limited by operating system, graphics quality and processing power. I wanted the choice to be more versatile and instead looked into single board computers with x86/x64 based architecture capable of running Windows if I wanted and with high quality sound/graphics options, even being able to connect/program some Pi-HATs to work if I wanted. Enter Hackboard 2, the budget mixture product. Not going to bother with the DigiOne Signature now I already have a Pink Faun PCIe S/PDIF card, as I can implement the Pink Faun with any computer system that provides hardware access to the PCIe bus and the power connection options on the PCIe card are better than on the HAT. I can even upgrade the clock and change the output connector board and fixing bracket if I want. Very few more powerful computers offer access to a Pi-compatible 40-GPIO layout so a £225 spend on the DigiOne Signature would be less versatile and with some operating systems, will require some additional programming to get working. I can still implement Graham's DAK supply for the card but will need an extra 12V LPSU for the computer, which will set me up for future-12V low power x86/x84 computers.
Lautus S/PDIF>Majestic>Lautus-R3>2xProprius>MySphere 3.1
Back to Top
brubacca View Drop Down
Regular
Regular


Joined: 28 Jan 2021
Location: Pennsylvania
Status: Offline
Points: 49
Post Options Post Options   Thanks (0) Thanks(0)   Quote brubacca Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar 2021 at 1:00am
Raspberry Pi4 with Volumio is a simple as it gets.  For digital output try the Pi2AES card or Allo Digital DigiOne or DigiOne Signature.  

Regards,
Charlie
Pennsylvania, USA
Back to Top
Ash View Drop Down
Senior Member
Senior Member
Avatar

Joined: 18 Mar 2013
Location: Dorset
Status: Offline
Points: 3458
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 16 Mar 2021 at 7:57pm
I do wish computers were even more modular than they are. Plugging in what you want and leaving out what you don't want.

Motherboard computers are just a few things plugged together, simple stuff. The programming that controls it all is the hard bit.
Lautus S/PDIF>Majestic>Lautus-R3>2xProprius>MySphere 3.1
Back to Top
less View Drop Down
Senior Member
Senior Member
Avatar

Joined: 27 May 2008
Location: Clevedon
Status: Offline
Points: 334
Post Options Post Options   Thanks (0) Thanks(0)   Quote less Quote  Post ReplyReply Direct Link To This Post Posted: 16 Mar 2021 at 12:35pm

/Quote (Graham Slee )

 Something I've been discussing with Bob by email was how professionals used to be able to spec up 'preamp system' and in particular using the old Studer catalogue. That was crammed full of every conceivable audio circuit at the time (late 80's... all analogue), and each circuit was on a plug-in eurocard or euromodule. These were plugged into a card frame with roughly 16 slots to 'build' a customised preamp or even mixer system. /Quote

At the risk of upsetting Ash, this is also how some computers were / are built! Choose your cards, slot into frame load os and boot up.

Perhaps Ash that is the sort of solution that might suit you, based on your previous posts.

Regards
Les 
I don't do mediocrity!

Les Sutherland
Back to Top
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Telling it as it is

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 10802
Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 2021 at 10:39pm
Pin 126 is Dout AKA SPDIF at logic level, and if that were connected to a toslink transmitter there would be no I2S at all.

Assuming the card works, as my equivalent did not.
Not simple enough for Google-Bot to understand...
Back to Top
Ash View Drop Down
Senior Member
Senior Member
Avatar

Joined: 18 Mar 2013
Location: Dorset
Status: Offline
Points: 3458
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 2021 at 8:38pm
https://www.silicondevice.com/file.upload/images/Gid1508Pdf_CM8888DMS_Datasheet_v1.1.pdf

^ Go to page 10

I guess the only way to beat a S/PDIF transport into an external DAC, which is essentially I^2S -> S/PDIF out -> S/PDIF in -> I^2S, is no conversion from I^2S in the first place. But as I^2S isn't a durable transport medium, the transmission distance would have to be very short so the transport and the D/A converter would have to be on the same isolated PCB with a linear power supply. This is beyond my abilities sadly.

Anyone who does the above with a DAC like Graham's is going to absolutely smash digital audio out of the park!


Edited by Ash - 15 Mar 2021 at 8:40pm
Lautus S/PDIF>Majestic>Lautus-R3>2xProprius>MySphere 3.1
Back to Top
 Post Reply Post Reply Page  123 47>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.094 seconds.