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Old 17th December 2014, 09:25 PM   #11
rkondra is offline rkondra  United States
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I have been playing with and using the Elektor board for a while. It works just fine.
There is some goofy stuff that I wont populate when I build my next one such as zeners clamping IIC (I will just use a 3.3V arduino for programming), some extra headers, op amp buffers on the aux analog inputs, and so on.

The input caps are too small (0.1 uF resulting in -3dB @ 80 Hz) which is easily fixed by replacing or paralleling 1.0 uF caps.
The output circuit is wierd, but works OK. Quick and dirty measurements show flat response (with the input caps fixed), 5KHz square waves just fine, with a hint of ripplie on top. Distortion < 0.01%.
The output clips with 6V PP applied on the input, output is 2V PP at clipping.
All this with Sigma Studio configured for pass - through.
Noise is not a problem with my 96 dB W/M speakers.

No problems here that cannot be solved with a couple of op amps.
Sigma Studio is pretty nice.
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Old 17th December 2014, 09:58 PM   #12
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Quote:
Originally Posted by Julf View Post
Nice that the platform is open source - shame that SigmaStudio seems to only run on Windows.
My thoughts exactly.

One of my biggest gripes about miniDSP (which I own) is the fact I must use Windows to configure it.

When I saw this "FreeDSP" my first reaction was to get excited, expecting Linux support.



Looks like I might as well stick with miniDSP...

P.S. Why anyone designs software for nerds that only runs on Windows is completely mind-boggling to me.

Last edited by cogitech; 17th December 2014 at 10:01 PM.
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Old 18th December 2014, 04:53 AM   #13
TNT is offline TNT  Sweden
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Isn't all minidsp stuff ok for mac via Adobe Air. I use it.

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Old 18th December 2014, 02:03 PM   #14
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Isn't all minidsp stuff ok for mac via Adobe Air. I use it.

//
That is ironic. MiniDSP works with more operating systems than freeDSP.

I encourage the freeDSP team to consider this issue seriously.
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Old 18th December 2014, 04:48 PM   #15
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The real issue is AD's Sigma Studio. It only runs on Windows boxes. The FreeDSP team has no control nor influence over that.
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Old 18th December 2014, 06:23 PM   #16
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The real issue is AD's Sigma Studio. It only runs on Windows boxes. The FreeDSP team has no control nor influence over that.
Mostly correct. However, AD does offer "SigmaStudio Network Utility for Linux". SigmaStudio Network Utility for Linux [Analog Devices Wiki]

This allows a Linux box with DSP(s) connected to run a network service (sigma_tcp) which can be controlled by a remote Windows computer running SigmaStudio.

What this tells me is that the drivers for Linux are already there and functioning - the Linux box can communicate and "program" these AD DSPs. The only thing missing is a native GUI for Linux. How hard could that be?

I am just used to associating the terms "free" and "open" with "free" and "open" operating systems. To have a project named "freeDSP" which relies 100% on a non-free operating system seems contradictory and ironic.

Last edited by cogitech; 18th December 2014 at 06:25 PM.
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Old 18th December 2014, 06:32 PM   #17
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Wow ...

I just looked at the link you provided. That's convoluted and confusing.

Do you hate Windows that much? Ha, ha ...
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Old 18th December 2014, 06:34 PM   #18
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Do you hate Windows that much? Ha, ha ...
Yes.
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Old 18th December 2014, 06:37 PM   #19
Julf is offline Julf  Europe
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Yes.
For a host of good reasons...
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Old 18th December 2014, 06:38 PM   #20
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I'm going to see if I can get SigmaStudio to run in WINE...

Perhaps WINE will cause some sort of issue since SigmaStudio will assume it is running in Windows and not use the right drivers for the DSP, however one way around this might be to run the native linux sigma_tcp service listening on 127.0.0.1 and then run SigmaStudio in WINE and use the "TCPIPADAU17xx" module to connect to localhost (127.0.0.1).

Worth a try!

Too bad I am at work, where I am forced to use a Windows machine.

Last edited by cogitech; 18th December 2014 at 06:48 PM.
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