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How simple can an audio computer be?

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Ash View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2022 at 9:50pm
The UP Xtreme i11 0000 version I have has a 40-pin GPIO, with the same pinout as the Raspberry Pi 3/4. So I might be able to get the Pi2AES Lite working with my PC motherboard as well as from the Pi3B+. All depends on the drivers I guess. Would be cool to compare the GPIO path vs the PCIe path from the same processor with the same linear power supply.
A person convinced against their will is of the same opinion still.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2022 at 10:50pm
So rather frustratingly, about three days after I purchased the Pi2AES Lite, the manufacturer updates the product documentation saying they are dropping the external 5V jack option, part of the reason I bought the product. It was omitted due to a low voltage condition at the Pi. But rather than taking a few extra days to try to resolve the problem, they just abandon any further effort in order to rush to release the product. I didn't want to cancel my order but if I did, I only had a tiny window of opportunity to do so as it was rapidly dispatched whilst parts of the site still advertise the external 5V facility. They kept the 5V jumper on the board though so I can still DIY separate power connection for HAT and Pi but as there is no reverse polarity or overvolt protection with this, it would void my warranty... I'm confident the product will still be excellent but this has irked me a little as it almost feels like it gave up at the final hurdle. A metal case would have been better than an acrylic one too, for EM shielding. Oh well, shall DIY fix my little niggles and see if there are further audible improvements to be realized.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2022 at 11:06pm
Graham, what do you think about the whole 'separate power supplies' for HAT and Pi vs. one supply for both? More BS? Just power the whole thing from one linear PSU and that is as good as it gets? Or would there be a benefit to bypassing power regulation circuitry on the board, because the DAK 5V 3A supply is already very well designed with excellent stability and regulation?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 14 Nov 2022 at 4:40pm
If one circuit can modulate another circuit through a common power supply, then steps should be taken to isolate them from each other, and this has been the practice since the beginning of electronics.

Separate voltage regulators are often used for that purpose, but in the computer world that doesn't seem to be entertained.

For a start, the bulk power supply would need to be at higher voltage for each voltage regulator to drop sufficient volts for each to work.

But all that can be done at radio frequencies now, so as we don't turn the earth into another Venus...

(Just by shifting the crap out of your back yard to somebody else's doesn't make the crap go away)

In the Majestic each digital IC is supplied by its own linear voltage regulator from a much higher voltage supply. In fact, one IC has a dedicated "digital" supply voltage regulator, and a dedicated "analogue" supply voltage regulator (and then there's a separate double regulated supply for the analogue circuit).

But, being able to implement it in a tiny Pi + hat, would require it to be in a much larger box.

By the way, a Windows update revealed that my beloved SPDIF sound card is really a USB to SPDIF card, just like the Pi is. So I might as well use my Bitzie instead. LOL

Not simple enough for Google-Bot to understand...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 14 Nov 2022 at 10:09pm
I've bought a few more things Graham. A small fanless handheld single board computer; UP Squared V2, Intel quad-core Pentium with 16GB RAM so a capable Windows PC. Just received a 12V Beetronics 12 inch industrial touchscreen as well. Shall set it up tomorrow. Waiting for a Pink Faun USB bridge PCIe card to arrive for comparisons against the S/PDIF card. DAK 5V 3A supply will be implemented. Also waiting to re-buy a Bitzie from John C. Going to use it with Power Wire and the USB bridge to take Bitzie to the max. Photos will follow.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 2022 at 7:14am
Pink Faun also offer an i^2s PCIe bridge with HDMI-socket output. Are you curious Graham as to what sound quality could be obtained if you prototyped a Bitzie-size streamer that accepts i^2s at the back with dual analogue outputs at the front? You said that i^2s is not a durable transport medium over longer distances and is intended as inter (between) integrated circuit sound data transmission on a PCB. The cable between PCIe card and proposed streamer would have to be very short then; less than 1.5m, so can't have a Lautus ferrite? Perhaps even 0.6m is in theory too long? What if the proposed streamer mounts directly onto the card with PCB stand-offs and the jumper wires are less than 10cm? Morning daydream...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 2022 at 11:04am
Yes, although we did have up to a foot long flying leads between rudimentary prototype sections built up on veroboard using little adaptor boards for the chips, and fastened down to a plywood base, just to demo that we got the functions and connections right, when it came down to making the product itself, the warnings on the datasheets were observed. From memory I think it said one inch.
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