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New DAC from Allo ESS9028Q2M for RPI
New DAC from Allo ESS9028Q2M for RPI
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Old 13th March 2018, 04:08 PM   #171
cdsgames is offline cdsgames  Canada
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Default Opamp board

Discreet stage .
Attached Files
File Type: pdf OPAM 03.pdf (370.0 KB, 389 views)
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Old 13th March 2018, 05:16 PM   #172
absolutk is offline absolutk
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XLR?!
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Old 13th March 2018, 06:22 PM   #173
Dimdim is offline Dimdim  Greece
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New DAC from Allo ESS9028Q2M for RPI
This looks very nice.. very nice indeed..
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Old 14th March 2018, 08:49 AM   #174
cdsgames is offline cdsgames  Canada
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Its been weeks that we are in testing now, we have hundreds of reports.

Unit sounds..like a ess9038q2m with a class A stage..

Noise on oscillators rails is 600uV , analog stage 900uV . Everything is under 1mV.

This week we might release the driver of the DAC , or rather the driver of the MCU.

We have final PCBs , we will check it a few times and send it to PCB house
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Old 14th March 2018, 08:49 AM   #175
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by absolutk View Post
XLR?!
Of course.
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Old 14th March 2018, 11:13 AM   #176
soundcheck is offline soundcheck  Germany
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Great to see the progress.

My Qs:

1.
I don't see any supercaps as buffer or any other special caps you've been using on e.g. the Boss for the analog part!?!? Budget? No need anymore ?
Especially on class-A I'd expect plenty of local & fast power to be
a rather good idea.
2.
I don't see any external power options (jacks/jumpers) as we've been discussing several times for your other products!?!?
I mean, you applied related changes to e.g. your recent Boss revision.
Change on strategy once more?
3.
Will the new 5V SMPS, that can probably be used with the new HATs, also
be launched in conjunction with the new DAC?
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Old 14th March 2018, 12:04 PM   #177
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by soundcheck View Post
Great to see the progress.

My Qs:

1.
I don't see any supercaps as buffer or any other special caps you've been using on e.g. the Boss for the analog part!?!? Budget? No need anymore ?
Especially on class-A I'd expect plenty of local & fast power to be
a rather good idea.
2.
I don't see any external power options (jacks/jumpers) as we've been discussing several times for your other products!?!?
I mean, you applied related changes to e.g. your recent Boss revision.
Change on strategy once more?
3.
Will the new 5V SMPS, that can probably be used with the new HATs, also
be launched in conjunction with the new DAC?
1. They are there on the ess9038 PCB (better even then Boss)..dual
2. On the analog stage , not present , present on the controller board . You can feed external 15V. For the 5V you have 2 ways of feeding it + you can feed the RPI independently . I will try to make a doc explaining it.
3. Next week I will have a definitive answer on the SMPS (testing the latest PCB)
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Old 14th March 2018, 02:05 PM   #178
soundcheck is offline soundcheck  Germany
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Ah. There's another board. A controller board!?!
That's sounds more than just a power controller / power board!??

But that one at least generates +/-15V from 5V - doesn't it?

Only one 5V SMPS would than be required for this HAT solution!?!

Things are getting more complex by the post.

You said. You'll write it all up. We'll be patient.

Just to mention it.
The supercaps and these caps that'd been suggested by Greg (forgot the type) on the Boss do power the Boss DACs internal opamp output stage.
At least that's IMO their main benefit.
What sense does it make to have them now on the DAC HAT only!?!?
To me it'd even make more sense to have them on the output stage.
Anyhow. Never mind. I'm not the HW expert here. I do know usually
you have your reasons for doing things the way they are done.

In the end, what matters is the final result!


I think it would be great if you'd launch both products DAC and SMPS at the same time. Or better, the SMPS first.
It's better from a marketing perspective.
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Old 14th March 2018, 09:08 PM   #179
chris14 is offline chris14
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Default New Raspberry Pi 3+

Raspberry Pi 3 Model B+ on sale now at $35 - Raspberry Pi

Another round of testing maybe....It is a little faster and networking has been improved.
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Old 15th March 2018, 09:36 AM   #180
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by soundcheck View Post
Ah. There's another board. A controller board!?!
That's sounds more than just a power controller / power board!??

But that one at least generates +/-15V from 5V - doesn't it?

Only one 5V SMPS would than be required for this HAT solution!?!

Things are getting more complex by the post.

You said. You'll write it all up. We'll be patient.

Just to mention it.
The supercaps and these caps that'd been suggested by Greg (forgot the type) on the Boss do power the Boss DACs internal opamp output stage.
At least that's IMO their main benefit.
What sense does it make to have them now on the DAC HAT only!?!?
To me it'd even make more sense to have them on the output stage.
Anyhow. Never mind. I'm not the HW expert here. I do know usually
you have your reasons for doing things the way they are done.

In the end, what matters is the final result!


I think it would be great if you'd launch both products DAC and SMPS at the same time. Or better, the SMPS first.
It's better from a marketing perspective.
Yes somewhere in this thread you can actually see the "controller hat" that has the MCU and also DC/DC convertor (5V to dual rail 15V)

So yes you can use only one 5V to power the Katana or Katana+RPI
Of course you can also power controller hat with 5V separate from Katana (ess9038) 5V (and then decide if you want to power the PI separately)

As far as supercaps , they are in the analog stage of the ess9038q2m AND for Vref..clean power AND close to load (Avcc) is best. Of course we have a 3 supercap (different than what you see normally in our designs)

Scaps are backed up by film capacitors , in fact we are using over 25 film capacitors in this design.

SMPS...we will know soon :-)
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