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carlos515 22nd May 2017 02:55 AM

I also watched a YouTube with SigmaStudio .
I have a question on the usb eval board. I will use a CY7C68013A--Cypress board with the freeusbi board on top. Now the freeusb uses a 5v supply on pin 4 of the interface to their dsp. I can set it up to have no voltage on pin 4. But looking at the schematic for header 506 I see no voltage reference on pin 4. I do see the reference to 3v3 lines. Will the dsp get the power needed from the clk , etc pins? If needed i will purchase the AD usb board but i am just trying to save the 130 cad for the programmer.

ohdsp 22nd May 2017 09:05 AM

Pin 4 is not connected on the USBi header on my DSP board. The board will need to be powered as normal - the freeusbi will not power it.

The same is true with the proper Analog Devices interface.


carlos515 22nd May 2017 03:36 PM

Ok Thanks ,

yurgs 18th September 2017 09:43 AM

Hello Paul, really nice Project!
i wonder if building this is a bit out of my depth, but it looks very interesting.
Carlos, did you finish building yours? would be interesting if your Cypress board works with it.

carlos515 18th September 2017 04:02 PM

Hi yurgs ,
I got as far as building the reflow toaster oven for the boards , then family life got busy . I will say that a reflow toaster or a hot air rework station will be beneficial .


ohdsp 19th September 2017 11:41 AM

Thanks for the comment yurgs.

I need to invest in a hot air station at some point. Have been managing okay so far except my first attempt at mounting an XMOS chip on the CoreOne PCB went very badly.

Toaster oven would be nice but just running out of space to put things really!

yurgs 19th September 2017 07:28 PM

i was hoping to get away with conventional soldering:o, so far i was fine with 0805, have not touched anything smaller :-) so there is lots to learn.
@carlos. i guess for now i would like to nail together one DSP, and a reflow oven would be awesome but it is sort of blowing things out of proportion for me..

maybe a hot air station would do the job for..
Paul, did you solder the dsp from your project page with a normal soldering iron?
the XMOS is for the "control board"? i was wondering how this is getting along:)

ohdsp 19th September 2017 08:09 PM

I did three DSP chips with a normal soldering iron (2.4mm bit? or bigger...). The big via in the thermal pad makes it easier to do. Using solder wick around the edge pads seems to help apply solder in just the right amount and remove any excess at the same time, but you need some extra flux.

The xmos chips didn't work so well. The first one soldered to the PCB okay but there was a permanent short between two of the power rails, after much head scratching the only solution was to remove the XMOS chip itself. The PCB seemed okay, but when trying to fit the replacement XMOS chip the large via in the thermal pad just started to disintegrate writing off the whole PCB.

As the XMOS chips (XEF216-512-TQ128) I was using cost 15 each, and I had identified several design issues already, I am working on a revised PCB. It should be easier to build. Also a lower memory version of the XMOS chip (XEF216-256-TQ128) is now available which is half the cost.

I am working on other PCB redesigns as well, and a new AK4458 DAC pcb. Supply of the ADAU1966 seems to have dried up a bit, or costs a lot more than I last paid. Once I have these I will order a few new batches of blank boards to build up when I have time.

princenk007 6th December 2017 05:27 PM

Hi ohdsp.
Thank you for sharing this project. Great flexible boards to use as per requirement.

I have a question. What is the role/functions of Xmos board? I see the multiple interfaces USB, Ethernet, SPDIF, I2S, I2C etc.
I was wondering if it is also used as an MCU for 1452DSP chip for real time parameter settings control like using buttons or rotary encoder with display?

Thank you.

ohdsp 6th December 2017 06:21 PM

Thanks princenk007,

I based my original idea around the ADAU1452 as it is just simple to use, and ideal for systems using as crossovers/equalisers, maybe even some simple room correction. As a stand alone board it is very flexible.

My long term goal is to play with USB audio and network streaming/control if I can. I also wanted a microcontroller so you could add in an array of external controls/display and so on. The XMOS 200 chip looked like it might fulfil most of the roles, and possibly even some DSP functions as well removing the need for the ADAU1452 board in some instances - such as a USB sound card.

It's all a long way off, the new design revisions I am working on are mostly there, but I need to finish and check these. There are also several bugs I need to work out on the old hardware before I finish these. There would be the coding needed for the XMOS 200 and this may take a while.


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