So, what's the current status of everything?

[Grench]

And on an update: While the DigiKey package arrived, the part I needed to modify the Display board to change the prototypes to basically the final version wasn't in the package. Meeeh,
So I can't update the display boards.

But I still can check and work on the mainboards, as I have everything for that here

Glad to see that there is movement on these. My questions are casual and based on curiosity - don't bother to answer if you don't have time to deal with it. Although I'm obviously looking forward to the prototype, don't let the prototypes prevent you from your more profitable ventures or from having a Merry Christmas and Happy New Year and spending some good quality time with your family.

If I recall right on the mainboards - there were a few very tiny resistors that were not positioned right and had to be removed, cleaned up, repositioned and re-soldered on. Pretty close to microsurgery with a soldering iron is my interpretation. Is that what you are working on or was there something more to it?

Display boards modifications? I wasn't aware that there was much left to do on those. Hope the parts come in without drama.

Is that it then? Are you comfortable that you have the plastics sorted out?

Thanks again!

 

[Confuzzled]

I'm hardly an expert, but I always imagined that modern audio processors do some sort of interpolation to bring the digital signal up to the DACs native sample-rate, and then filtered the signal in analogue-land to eliminate any interesting artefacts left over from the time quantisation.

Trying to interpret a sample-stream as a stepped wave seems clearly the worst option for audio. Real sounds don't have sharp edges in them like that! (Except, perhaps, for detonations and extremely violent impacts?). Other things aside, you'll have trouble finding a loudspeaker that can accurately reproduce step functions...

You really, really need to watch at least the second video I posted links to above earlier. Filtering is actually far easier in the digital domain*, and the output of a DAC is not square waves - essentially the digital numbers give the coefficients of different frequencies and magnitudes of sine waves that need to be added together to give the intended output. This has the side effect that a DAC cannot reproduce a square wave, as it would need to sum an infinite series of sine waves to get a step function.

e.g. High quality Notch filters are expensive in the analogue domain, but trivial to do digitally.

 

[oskda]

Did you read the whole message or did you just stop to read when you want?

I did. Your message said «Comparing x86 with ARM. Nice. Edit: Wrong FORUM, lol».

Obviously from previous message (not yours) I understand he compares actual PC x86 CPU with actual mobile ARM CPU, and we can't compare them in a lot of cases. If you'd write «Comparing actual PC x86 with actual mobile ARM» you would be correct.

(Although I think it may be you wanted to point that x86 vs ARM is not a matter for this forum)

The question I wanted to point, the one you didn't get: it is not a problem/limitation of ARM architecture but a limitation on power (energy-heat-etc). If you had a x86 cell phone/mobile (and we did: there were x86 smartphones), you would have the same problem: power.

There is a lot of misconception about ARM (I have seen all types of misconception it).

An ARM CPU can be as powerful as a x86 CPU, even more powerful, if it is built with same number of transistors, integration, etc. And I know about some ARM CPU with more power than some x86 CPU (both around same age; obviously if you compare CPUs too far in time, it losses sense).

 

[Xcl4m4t10n]

Quite excited for my Braveheart

Please, share impressions when it arrive ^^

 

[levi]

I guess these are the US-cellular prototypes we've been waiting for, 8 of them. I'm not sure I've seen that funky red lid before, and it seems to be being used with grey bottom plastics, so I guess it's actually an example piece ED it pressing into service.

 

[EvilDragon]

Not all of the prototypes will be US ones, and these are not yet finished (they need to be tested), but yes, it´s the Work in Progress for the prototype orders.

 

[Akko]

the output of a DAC is not square waves (...) a DAC cannot reproduce a square wave

Any DAC I've ever worked with has been perfectly able to output square waves (ignoring non-zero rise and fall times of course). A DAC basically just converts a number on an input to a voltage (usually, but it could just as well be a current) on its output - if the number on the input changes between the minimum and maximum all the time then the DAC will happily output a square wave for you.

 

[matzesu]

So dit the right Parts from Digikey finaly arived ?? , Cool then its not that far away from hopefully Picturefull Reviews from the Protoyph Guys ^^

Hopefully Trump ditnt make a Ameriexid so they can still be shipped to the Greatest Country in the World (whit the Biggest Atombutton).. ^^ (I want a discussion about the Pyra in this Thread, dotnt derail it whit politics..)..

 

[ClockworkCoder]

the Greatest Country in the World

I hope you washed your hands after typing that.

Do you recognise your new baby from the photo @Grench?

 

[crazyhorse]

Wonder who the lucky person is who is getting the transparent one? They look awesome!

 

[matzesu]

I meant Amerika, (at least Geographical).. , there are Federal States, which are bigger than Germany.. ^^

 

[Djoga'Ro]

@Akko "perfectly" and "ignoring non-zero ..." doesn't go together. If a DAC/DACs are capable of outputting square waves depends on the tolerances you're prepared to allow. Or in other words, DACs can approximate square waves, but cannot output perfect ones - especially not fine steps at the sample rate. And, this is, what Confuzzles was saying, as I understand it.

 

[Akko]

@Akko "perfectly" and "ignoring non-zero ..." doesn't go together. If a DAC/DACs are capable of outputting square waves depends on the tolerances you're prepared to allow. Or in other words, DACs can approximate square waves, but cannot output perfect ones - especially not fine steps at the sample rate. And, this is, what Confuzzles was saying, as I understand it.

That's nitpickery, *nothing* can output *perfect* square waves. A maximum step from say 0V to 5V at 44kHz is ~0.22V/µs (if I didn't mess that up, I'm still not quite awake ^^) which is definitely doable with a good DAC. The first one I found right now can do 35V/µs for example.

What *I* was mainly trying to say is that (common) DACs do not output several added sinus waves but rather a voltage defined by a series of input values directly converted to a series of output values.

 

[Letalis Sonus]

What *I* was mainly trying to say is that (common) DACs do not output several added sinus waves but rather a voltage defined by a series of input values directly converted to a series of output values.

Try outputting a constant voltage using one - you'll be surprised.

 

[Akko]

Try outputting a constant voltage using one - you'll be surprised.

I have - no surprises there. A DAC fed a constant input value should have no problems outputting a constant voltage. If it can't do that, something is wrong with it. I'm not sure what kind of DAC you've used...

 

[matzesu]

Im happy whe ditnt take my Posting for a Politikal Discussion about Onkle Donald and his Great Big Atom Button.. ^^

I wonder who gets the Red Prototyphe, its not my Color, i would like to be the Guy who gets the Blue Prototyph, but maybe i can get my MP Unit in Black or Blue..

Green would also be nice, like my GBA Micro, the Switch Lite and my Green Transparent GBA Classic...

 

[T.T.]

I have - no surprises there. A DAC fed a constant input value should have no problems outputting a constant voltage. If it can't do that, something is wrong with it. I'm not sure what kind of DAC you've used...

If the DAC has a DC blocking cap placed on its output, then that could certainly be a problem. But given that apparently the DAC drivers specify a DC offset, then blocking caps are probably not present (or not recommended by the datasheet). Although, I think the sound card in my desktop is AC coupled, I'll have to look at the board next time I think about it.

 

[Djoga'Ro]

@Akko Maybe I misread something, but to me it looks like Confuzzled said "If you look very close, DACs can't reproduce square waves." and then you said "If you don't look too close, DACs can reproduce square waves." but word it, as if you were contradicting C. *scratches his head*

 

[oskda]

I guess these are the US-cellular prototypes we've been waiting for, 8 of them. I'm not sure I've seen that funky red lid before, and it seems to be being used with grey bottom plastics, so I guess it's actually an example piece ED it pressing into service.

Are those matte/coated black or are they normal black without coating?

Post automatically merged: Dec 18, 2019

... who is getting the transparent one? They look awesome!

Until you turn on lighting LEDs and it looks really blinding or simply a torch

I think transparent case would be nice as accessory, a replacement case on shop, but no as standard case.

Even I continue thinking it would be nice as an option to paint your case the way you want (painting internal plastic transparent case).

 

[everfresh]

Green would also be nice, like my GBA Micro, the Switch Lite and my Green Transparent GBA Classic...

Green is the best color for the GB Micro imo, my brother used to collect them and he has had one in almost every color they came in, including most of the special editions.

On topic, I absolutely love the way the red one looks with the marbling in the case. I know the color discussion is closed for now, but these look really organic and I like it