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γ3 high resolution DAC development

gamma3, gamma24 (plug-in for the γ3)

Re: γ3 high resolution DAC development

Postby mp101 » February 12th, 2016, 5:36 am

1st post with new account!! sure i had one, maybe just lurked?

Awesome!! as usual

anyone fancy building me one? ;) ;)
haven't been finding the time to build even the smallest AMB amps or dacs

cheers
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Re: γ3 high resolution DAC development

Postby Rabbit » August 28th, 2016, 7:15 am

AMB: I have a question regarding your power supply photo.

I may have stared at the photo for too long. I'm assuming that you are using the quad secondary xfmr for the gamma24 + alpha24 and the donut xfmr for the always-on LCDuino (as is shown in the wiring diagram). I noticed you have 2 pairs of wires coming out of the sigma11 that powers the gamma24. What's the second pair doing? (Or, am I just incorrect about the xfmr configuration?) Thanks!
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Re: γ3 high resolution DAC development

Postby hagak » August 28th, 2016, 7:52 am

I think his second pair powers the on led for the psu.
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Re: γ3 high resolution DAC development

Postby amb » August 28th, 2016, 9:44 am

That's correct, it's for the front panel LED. An inline resistor is hidden and wrapped in heat-shrink tubing.
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Re: γ3 high resolution DAC development

Postby Rabbit » December 19th, 2016, 6:11 pm

One more question (after a break from working on the gamma3, I'm back at it.) In the power supply wiring diagram, RLED and LED are between SSRTRIG and V- of the Sigma11. I was unable to find any information on those except in the parts list and that diagram. Are they shown somewhere in your power supply photo? Thank you again!
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Re: γ3 high resolution DAC development

Postby amb » December 19th, 2016, 9:56 pm

Rabbit wrote:One more question (after a break from working on the gamma3, I'm back at it.) In the power supply wiring diagram, RLED and LED are between SSRTRIG and V- of the Sigma11. I was unable to find any information on those except in the parts list and that diagram. Are they shown somewhere in your power supply photo? Thank you again!

For my build, I did something different than what the diagram shows. Instead of driving the LED from SSRTRIG, I used an output from the σ11 (for GVDD) instead, and hid the resistor inside the wiring loom. You can see the wires from the σ11's second output terminal block in the top view photo.

There is no inherent advantage one way or the other.
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Re: γ3 high resolution DAC development

Postby Rabbit » December 20th, 2016, 5:52 am

Thank you for the explanation, AMB.
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Re: γ3 high resolution DAC development

Postby DrizztDo » March 21st, 2017, 6:59 am

Hello,

is it possible to use the ζ1 Audio Widget for USB connection, and another I2S source with the γ3 backplane ?
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Re: γ3 high resolution DAC development

Postby amb » March 21st, 2017, 10:03 am

DrizztDo wrote:is it possible to use the ζ1 Audio Widget for USB connection, and another I2S source with the γ3 backplane ?

You can have one or the other, but not both.
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Re: γ3 high resolution DAC development

Postby DrizztDo » March 22nd, 2017, 2:48 am

OK thank you
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