Digital equalizer - TAS3103 - Page 2

Kay · 22nd September 2006, 01:21 PM

Hello Arnaud,
>In my case, for a simple implementation,
>input and output should be RCA.
o.k., but this part of the AD/DA-Converters.

Once more, at this moment I plan only the necessary parts
on the pcb.
Most time, there is not all clear in the docomentations,
so it will be necessary to make changes. This will be
done better on a prototype, than the completed board.
And second, it must be possible to allow the people use
different converters, and so on.

The rest should placed on a board that holding the other
modules, like PowerSupply, Converters, Connectors and so
on.
You know, what I mean, for development, it's a good idea
to have a board with simple changeable modules.
Later, if all checked, we can decide, what is really
necessary to finish the project.
If you like to have a simple AD/DA-Converter-Board,
I have some for the TLC320ad77. I can send you without
costs. I have simple modules for the TAS3001 too.
All one-layer-boards, a guy checked this, and it works.
If you like to play with this, maybe for starting the
programming, give me a info.
But I send you only the boards, you must get the parts
from TI or others.

What's your reason for do that all and don't buy the
groundsound-board?
I need only a "intelligent subwoofer" with a delay and
three parametric EQs.

What AD/DA-Converters do you like to use at the end?

Do you have the knowledge to handle the soldering?

Kay · 10th October 2006, 01:23 AM

maybe this is the way for a module, like a DIP32-Package

Kay · 15th October 2006, 10:40 PM

I post the new schema and the layout at

TAS 3103, that's all?

ar2012 · 16th October 2006, 09:54 AM

Hello,

Sorry for late feedback, i was quite busy those days.

Your approach with different small boards is fine for me.
The DIP module is great ! I need to further check your schematics but it looks OK (will try to do it today).
It should be OK to test the programmation.

Regarding AD/DA converter, i don't know which chip we should use. So, we can start with the one you already have as you have a board already validated.
With this board on top of the TAS3103, we should be able to do the first trials.

For the ferrite, i don't know either. The TI Eval board use a "Scientific conversions transformer 984-02": I had a look to the
Sientific conversion web site and couldn't find this device, it's may be obsolete. If so, we need to choose an alternative. Anyway, transformers seems to include already a ferrite. If you have any proposal.

Regarding soldering, i can manage, except may be the TAS3103 which have a very small pitch. I have only some manual equipments and my colleagues used to solder regularly told me that it would be very difficult to solder manually the TAS 3103.

You mentionned a Voltage limiter, TVS...., I can not finf it.
On which document / page is it ?
I have found no BOM on top of the EVM1 or 2 schematics.

I will check if we can convert the parameters from a analog filter to IIR or Biquad. I let you know.

You ask why i am doing all this ?
It is because i want to have digital equalizer to go with 1 way speaker project.
Do i answer your question ?

Best regards,
Arnaud

Kay · 16th October 2006, 04:43 PM

Hello Arnaud,

I hope some guys check my schema too, but I don't expect
any wonders.
I post it in another thread because I think, "digital"
may be better for the people to see it.

Quote:

You ask why i am doing all this ?
It is because i want to have digital equalizer to go
with 1 way speaker project.
Do i answer your question ?

yes

Quote:

TVS...

we don't need it, if we can be sure, that the voltage on
I²C is 3V3 max.
For programming via Centronics-Port, we have to think
about reading from I²C, because I'm in doubt, that 3V3
is enough. May be the best way is level-converter.
But don't forget, a handling of the 'Reset' is not on the
module.

Quote:

FB...

for test I use a resistor with 0R

ar2012 · 16th October 2006, 07:28 PM

Hi!

The microcontroller i will use to program the EEPROM (or configure directly the TAS3103) is the ATMEL AT90USB128. It is a 3V device, so no issue with I2C voltage limit.

By the way, why do you mention programmation by centronics port ? What is it for ?

Best regards,
Arnaud

Kay · 16th October 2006, 08:30 PM

Hello Arnaud,

Quote:

why do you mention programmation by centronics
port ? What is it for ?

maybe I or others guys can use I²C via Centronics.

o.k. and I forgot, that you use the Atmel-USB,
and so you don't need any protection on I²C!

ar2012 · 18th October 2006, 03:17 PM

Hello,

I checked the schematics and it looks OK.

Do you think we can go for the first assembly and trials ?

We can start with analog input/analog output.

Best regards,
Arnaud

Kay · 18th October 2006, 06:44 PM

Hello Arnaud,

Quote:

Do you think we can go for the first assembly and trials?

I become no negative feedback,
so, I can mail you the Gerber-files for production.

Quote:

We can start with analog input/analog output.

For me is the TLC320AD77 enough.
I send you the schematic. There I defined the corrections.
Please ask me, if you don't understand!

Should I send you the Gerber-Files for both?

Where do you like to produce the PCBs?

See the picture of the codec-board.
It's single layer too (50x32mm²), but with some wires
(blue).

sek · 16th November 2006, 07:17 PM

Hi Kay,

haven't You been the one who rejected my offer for support for this project idea of Yours a couple of years ago? From what You used to reply back then, You wanted to finish this project quickly and not work together with people who take their time - and plan in months for their projects to come true...

...just for the record: You beat me by years!

How is this project coming along?

Ciao,
Sebastian.

22nd September 2006, 01:21 PM	#11
Kay diyAudio Member Join Date: Nov 2001 Location: Osnabrueck (Germany)	Hello Arnaud, >In my case, for a simple implementation, >input and output should be RCA. o.k., but this part of the AD/DA-Converters. Once more, at this moment I plan only the necessary parts on the pcb. Most time, there is not all clear in the docomentations, so it will be necessary to make changes. This will be done better on a prototype, than the completed board. And second, it must be possible to allow the people use different converters, and so on. The rest should placed on a board that holding the other modules, like PowerSupply, Converters, Connectors and so on. You know, what I mean, for development, it's a good idea to have a board with simple changeable modules. Later, if all checked, we can decide, what is really necessary to finish the project. If you like to have a simple AD/DA-Converter-Board, I have some for the TLC320ad77. I can send you without costs. I have simple modules for the TAS3001 too. All one-layer-boards, a guy checked this, and it works. If you like to play with this, maybe for starting the programming, give me a info. But I send you only the boards, you must get the parts from TI or others. What's your reason for do that all and don't buy the groundsound-board? I need only a "intelligent subwoofer" with a delay and three parametric EQs. What AD/DA-Converters do you like to use at the end? Do you have the knowledge to handle the soldering? __________________ best regards Kay

15th October 2006, 10:40 PM	#13
Kay diyAudio Member Join Date: Nov 2001 Location: Osnabrueck (Germany)	I post the new schema and the layout at TAS 3103, that's all? __________________ best regards Kay

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16th October 2006, 09:54 AM	#14
ar2012 diyAudio Member Join Date: Jan 2006 Location: France	Hello, Sorry for late feedback, i was quite busy those days. Your approach with different small boards is fine for me. The DIP module is great ! I need to further check your schematics but it looks OK (will try to do it today). It should be OK to test the programmation. Regarding AD/DA converter, i don't know which chip we should use. So, we can start with the one you already have as you have a board already validated. With this board on top of the TAS3103, we should be able to do the first trials. For the ferrite, i don't know either. The TI Eval board use a "Scientific conversions transformer 984-02": I had a look to the Sientific conversion web site and couldn't find this device, it's may be obsolete. If so, we need to choose an alternative. Anyway, transformers seems to include already a ferrite. If you have any proposal. Regarding soldering, i can manage, except may be the TAS3103 which have a very small pitch. I have only some manual equipments and my colleagues used to solder regularly told me that it would be very difficult to solder manually the TAS 3103. You mentionned a Voltage limiter, TVS...., I can not finf it. On which document / page is it ? I have found no BOM on top of the EVM1 or 2 schematics. I will check if we can convert the parameters from a analog filter to IIR or Biquad. I let you know. You ask why i am doing all this ? It is because i want to have digital equalizer to go with 1 way speaker project. Do i answer your question ? Best regards, Arnaud

16th October 2006, 07:28 PM	#16
ar2012 diyAudio Member Join Date: Jan 2006 Location: France	Hi! The microcontroller i will use to program the EEPROM (or configure directly the TAS3103) is the ATMEL AT90USB128. It is a 3V device, so no issue with I2C voltage limit. By the way, why do you mention programmation by centronics port ? What is it for ? Best regards, Arnaud

18th October 2006, 03:17 PM	#18
ar2012 diyAudio Member Join Date: Jan 2006 Location: France	Hello, I checked the schematics and it looks OK. Do you think we can go for the first assembly and trials ? We can start with analog input/analog output. Best regards, Arnaud

16th November 2006, 07:17 PM	#20
sek diyAudio Member Join Date: May 2003 Location: Berlin	Hi Kay, haven't You been the one who rejected my offer for support for this project idea of Yours a couple of years ago? From what You used to reply back then, You wanted to finish this project quickly and not work together with people who take their time - and plan in months for their projects to come true... ...just for the record: You beat me by years! How is this project coming along? Ciao, Sebastian.