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Old 27th March 2011, 03:33 PM   #1
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Default PC controlled full digital plate amp

I'm developing a plate amp that uses I2S over a HDMI cable to transport the audio digitally to your speakers.
To keep things simple it does not have any HMI.
The amp will be controlled on the master side.
I want to use a USB 2.0 to 8 channels i2s to feed the plate amps with audio.
Then i want to use a usb connected PIC with a i2c multiplexer to communicate with the plate amps and set the bi-quids and volume.
Delays needs to be done on the computer as the DDX8001 does not support this.


Any one interested?
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Old 14th August 2013, 10:03 AM   #2
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Although nobody seems to be interested, i have finished this device with great success. Here are the pictures.

The I2S and I2C are generated by a Xmos sx1-l2 device (8 channel). The PCB is underdevelopment.

I have replaced the DDX8001 with a STA308a but this device produced to much noice.
Then I replaced the device with the TAS5508c, I also integrated PSCV in the design.
I used a meanwell 150W 48V power supply and modified it to accept PSCV, the supply is controlled between 12 - 60V.
The amp is ultra low noise although i do not have the instruments to do measurements.
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Last edited by egberttheone; 14th August 2013 at 10:12 AM.
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Old 14th August 2013, 05:39 PM   #3
Nisbeth is offline Nisbeth  Denmark
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Looks very interesting - and professional - good work

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Old 14th August 2013, 07:37 PM   #4
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I wish I had mad skills like that!
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Old 15th August 2013, 03:18 PM   #5
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Thank you for your kind reply.
I assembled the 6mm thick aluminium plate today, the plates are made in Germany by Protopanel.
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Old 16th August 2013, 04:35 PM   #6
Nisbeth is offline Nisbeth  Denmark
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Again - very impressive

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Old 17th August 2013, 09:57 AM   #7
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To control the amp; I have started a tread here: [diy] Another USB to multichannel I2S with I2C ?
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Old 20th August 2013, 05:44 AM   #8
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Hi egberttheone,

I would be very interested in an audio power amplifier, that could take AES/EBU signals for input. For example, such amplifier could be driven directly by RME Hammerfall DSP AES-32, see:
RME: Hammerfall DSP AES-32

Can you do it?.

Best Regards,
Bohdan
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Old 20th August 2013, 07:27 AM   #9
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That is possible; the only thing is that there are no PWM processors that can process this signal directly. This transport medium is also not made for low jitter (as far as I know).
You can easily translate AES3 to i2s.
Just out of curiosity: why would you like to have a DSP in front of your amp?
My plate amp has an on-board DSP.
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Old 20th August 2013, 08:42 AM   #10
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Hi,

Thank you for your response.

I need a digital sound card to use with Linear-phase DSP PC software.
It's called Ultimate Equalizer, please see the detailed description - Bodzio Software
I processes 8 channels in and 16 channels out with 32k FFTs (partitioned convolution) at 96kHz, so typical DSP just does not have the processing power for this - as far as I know.

Anyway, are you in the position to develop a prototype?.
I am seriously interested to cooperate/support.

Best Regards,
Bohdan
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