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Master clock and isolator for the MiniDSP USBStreamer
Master clock and isolator for the MiniDSP USBStreamer
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Old 4th November 2013, 12:44 PM   #21
Zoran is offline Zoran  Serbia
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Join Date: Jan 2004
Location: Belgrade
Hi
sorry but it is not quite clear from the thread title
"Master clock and isolator for the MiniDSP USBStreamer"
Master clock OK
Isolator OK
Mini DSP ? probably part of the device?
USB streamer? Which usb streamer? like integral part of the device OR something else?
thanks
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Old 4th November 2013, 12:56 PM   #22
JensH is online now JensH  Denmark
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Join Date: Jul 2009
Master clock and isolator for the MiniDSP USBStreamer
Hi Zoran,

Sorry, I just assumed that MiniDSP was a well known name on this forum. They have their own section under Manufacturers.

Anyway, this is the one I am talking about:
USBStreamer | MiniDSP
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Old 4th November 2013, 07:26 PM   #23
Zoran is offline Zoran  Serbia
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Join Date: Jan 2004
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Ah
Thanks
(I persume that is separate unit because of the marked in "square" on the PDf You send...)

I will follow the link
cheers
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Old 4th November 2013, 09:21 PM   #24
JensH is online now JensH  Denmark
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Master clock and isolator for the MiniDSP USBStreamer
It is a separate unit, yes. You can see it (blurred) behind my PCB in post #2 of this thread.
If you follow the link ti MiniDSP you can see a better picture of it. And you can download the manual as well.
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Old 14th December 2013, 05:00 PM   #25
JensH is online now JensH  Denmark
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Master clock and isolator for the MiniDSP USBStreamer
The V3 has been up running for quite some time now. I made a V4 of the design, which includes a mux, to allow a better handling of the situation where there is no power on the isolated (ADC/DAC) side and therefore no external MCLK.

But before I ordered PCB's for the V4, I decided to add another option, which makes it possible to use either a x or a x2 clock (relative to the normal 24.5/22.5 MHz MCLK). I hope to get the PCB in a few days and hopefully I will find the time to mount it sometime next week.

I have attached an updated block diagram, showing V5 with the PLL and the mux.

When there is no MCLK from the isolated side, the mux will select the lower input, which comes from the USBStreamer. This feeds the original MCLK back to the USBStreamer, hopefully avoiding a lock up situation, where the PC driver could hang.

The PLL can either be controlled using a jumper on a pin header, or a front panel switch can be added. I have also included a bypass resistor, so that the PLL does not have to be mounted.
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Old 16th December 2013, 02:53 PM   #26
alexmi is offline alexmi  United States
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Hello JensH, do you plan to offer these boards as a kit, for sale ?? I am very interested, just bought yesterday a USBStreamer and I'm waiting for a ES9018 DAC soon, very soon...

Thanks, alex
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Old 16th December 2013, 05:43 PM   #27
JensH is online now JensH  Denmark
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Join Date: Jul 2009
Master clock and isolator for the MiniDSP USBStreamer
I haven't really got a firm plan for it. It depends on the interest. If a few people are interested, I can probably deliver some bare boards, without components. If there is a lot of interest, it may make sense to deliver kits or perhaps even assembled boards.
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Old 16th December 2013, 06:15 PM   #28
JensH is online now JensH  Denmark
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Join Date: Jul 2009
Master clock and isolator for the MiniDSP USBStreamer
Here is a scan of the V3. V5 will be very similar.

On V5 I decided to remove also the local 3.3V regulator, since it can be supplied from the ADC/DAC board. The optional PLL is placed in this area, just below the middle of the PCB. In the top area the added mux has been squeezed in.

The V3 has space for additional isolators, but, as shown in the picture, I haven't mounted these, since I only needed a 2-channel version for now. And I have a limited number of isolators on hand.
Attached Images
File Type: jpg USBStreamer Interface V3_PCB.jpg (145.7 KB, 1052 views)
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Old 17th December 2013, 06:55 PM   #29
alexmi is offline alexmi  United States
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I would be extremely grateful if you would sell me a board, bare is OK, I have a friend with skills to solder minuscule parts.
Thanks, alex
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Old 23rd December 2013, 09:40 PM   #30
JensH is online now JensH  Denmark
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Join Date: Jul 2009
Master clock and isolator for the MiniDSP USBStreamer
V5 is now up and running. The mux on the USB side seems to work as intended. So when the power on the isolated side is turned OFF, the USBStreamer just gets its own MCLK back and there is no lock up problem. The transition seems to be smooth with no (apparent) interruption in the playback.

The PLL has only been tested briefly, but it is in the circuit and seems to work OK. Next step is to try it with a 12.288MHz clock input and X2 operation, so that the USBStreamer will still get 24.576 MHz.

I don't have a 45/49 MHz design to test it with, but I don't think that this will be a problem.

On this version I mounted all isolators to get 8 channels in/out. I decided to use one of the cables, which came with the USBStreamer, to connect it to the USBStreamer. On the previous versions I used a connector with an extension. The cable provides more flexibility in terms of positioning the interface and the USBStreamer in a box.
Attached Images
File Type: jpg USBStreamer Interface V5.jpg (127.0 KB, 1000 views)
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