Miro gave the option to inject external power supplies at those 0R jumper points.
If you don’t have the proper testing equipment for MSB adjustments, better off not populating the circuit, more likely to make things worse than better.
If you don’t have the proper testing equipment for MSB adjustments, better off not populating the circuit, more likely to make things worse than better.
For the option of external power like Vunce mentioned, and also for separate PSU between the two channels if you wish.
I also wanted to ask if it is possible, if desired, to connect a digital filter (spdiff) here?
Probably you can have digital filters and OS implemented, but since the essence of Miro's designs of the various DACs stemmed from avoiding them, you probably no longer can call it this :
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Do you mean the switcher implemented directly in the I2S to PCM CPLD (2 functions in 1 CPLD? 😁) ... it is possible, but it needs a lot of testing and coding 🤓
The easiest way is to use this inputs selector as separate device 🤔 #2909
This is possible with CPLD, but you need to modify the VHDL code to fit the SAA7030 🤣
yes that's what i was thinking (aloud) may be add a visual interface. Well that will depend how fast I could learn/implement VHDL I guess. I think its more efficient this way. While I was doing some surfing I did come across a gentleman who had implemented the core of PCM2706 in CPLD as college project.
Lets see.
About post#2909 I already have the boards with my, populated all of them now I have a few extra. I am keeping only 2 of them.
@rehanabid
I implemented that switch into the 20-bit project, untested, you can test it.
Connect button on pin 3 and GND (pin 3 will be shorted to the GND with this button).
There is not implemented debouncer in code. I tried to avoid it by configuring the input as schmitt trigger (maybe it does not work that way and switching inputs will be chaotic - if so, try to add a small capacitor (47nF?) on pin 3 and GND as a passive button debouncer).
Maybe it won't work at all 😁
I implemented that switch into the 20-bit project, untested, you can test it.
Connect button on pin 3 and GND (pin 3 will be shorted to the GND with this button).
There is not implemented debouncer in code. I tried to avoid it by configuring the input as schmitt trigger (maybe it does not work that way and switching inputs will be chaotic - if so, try to add a small capacitor (47nF?) on pin 3 and GND as a passive button debouncer).
Maybe it won't work at all 😁
Attachments
Thanks @miro1360 just waiting for my boards to arrive, which are currently stuck in customs. With eid holidays and all that hopefully receive them somewhere next week, after that I will start experimenting with them.
Hopefully will come-up with something, should i succeed will share it here.
miro highly appreciate you willingness to share, efforts of your hard work with the DIY community.
@rehanabid
Now I figured out, that you asked for "3 I2S inputs to 1 PCM output" and I created the opposite (1 I2S input to 3 PCM outputs)
Here is the correct version "3 I2S inputs to 1 20-bit PCM output" 😎
Now I figured out, that you asked for "3 I2S inputs to 1 PCM output" and I created the opposite (1 I2S input to 3 PCM outputs)
Here is the correct version "3 I2S inputs to 1 20-bit PCM output" 😎
Attachments
thanks miro will experiment with the code once I receive the cpld boards. once successfully tested will share with rest of the board.Now I figured out, that you asked for "3 I2S inputs to 1 PCM output" and I created the opposite (1 I2S input to 3 PCM outputs)
Here is the correct version "3 I2S inputs to 1 20-bit PCM output" 😎
This with CPLD is a real job. There is also Spartan 7 now... 100,000 logical cells...
Even filtration can be done with Spartan.
No one alive has a chance to guess that there is a filter when this processes.
Here is an exercise from the Faculty of Electrical Engineering here on how to do it
http://home.etf.rs/~milic/Solution_Manual/Chapter_4_exercises/Chapter_4_exercises.html
Even filtration can be done with Spartan.
No one alive has a chance to guess that there is a filter when this processes.
Here is an exercise from the Faculty of Electrical Engineering here on how to do it
http://home.etf.rs/~milic/Solution_Manual/Chapter_4_exercises/Chapter_4_exercises.html
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And the price is much higher. It doesn't even have to be cheap. I don't care about the price if it's good. Not good but the best.