Simon Moon Posted July 22, 2019 Share Posted July 22, 2019 I was just getting ready to order a Sparky / Bridge, but found out they are discontinued. They are going to come out with a new product to replace it, but they are going to use a RPI instead of the Sparky. This sounds like a mistake to me, and the Allo website actually agrees. They state the following about the disadvantage with using a RPI: "First, laptops are noisy... very noisy. On USB we usually see spikes at 100mV of noise. That will have an impact on sound system. How about RPI? RPIs are great and very energy efficient, but on USB they have 2 major flaws. First is that bandwidth is shared between the 2 USB ports (so in fact there is only one USB), and second is that ethernet is also shared on same bus! Of course, you also have the noise on USB at about 60mV. Maybe Sparky? The 2 USB ports (next to the ethernet port) share one input to the CPU (split by a hub). Noise on USB bus is about 27mV (pretty good) and ethernet is completely apart (bus is not shared). So it's ok, but not great." So, could someone please explain Allo's thought process here? Link to comment
Yatsushiro Posted July 23, 2019 Share Posted July 23, 2019 My understanding is that they are using an RPi Compute Module on a custom 'motherboard' thereby avoiding the majority of the 'normal' RPi limitations. Link to comment
Simon Moon Posted July 23, 2019 Author Share Posted July 23, 2019 Thanks for the response. If that's the case, then it makes perfect sense. Link to comment
Yatsushiro Posted July 23, 2019 Share Posted July 23, 2019 An early PCB, showing the RPi CM3 https://www.diyaudio.com/forums/attachments/vendor-s-bazaar/764107d1561102569-shanti-dual-lps-5v-3a-5v-1-5a-usbridgesigrev4-pdf Link to comment
Simon Moon Posted July 25, 2019 Author Share Posted July 25, 2019 I just saw on another forum, as of June 19, the Allo USBridge Signature is "6 weeks away max". This is good news, if true, as that means only a couple of weeks from now. We can hope this is true. Link to comment
matthias Posted July 27, 2019 Share Posted July 27, 2019 On 7/25/2019 at 10:27 PM, Simon Moon said: I just saw on another forum, as of June 19, the Allo USBridge Signature is "6 weeks away max". This is good news, if true, as that means only a couple of weeks from now. We can hope this is true. According to "cdsgames" at diyaudio mid August: https://www.diyaudio.com/forums/vendor-s-bazaar/337859-shanti-dual-lps-5v-3a-5v-1-5a-16.html#post5837226 Matt "I want to know why the musicians are on stage, not where". (John Farlowe) Link to comment
matthias Posted August 7, 2019 Share Posted August 7, 2019 New announcement shipping before September 10. Matt "I want to know why the musicians are on stage, not where". (John Farlowe) Link to comment
Simon Moon Posted August 7, 2019 Author Share Posted August 7, 2019 Sounds great! Thanks for the update. Not on the website yet. Link to comment
Tintinabulum Posted August 7, 2019 Share Posted August 7, 2019 If they are just getting the new PS out, doing this at the same time is quite ambitious! Bold... Link to comment
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