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Help Needed: Any DAC mod or build veterans here ?

yogibear

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#1
Out of curiosity I acquired a dual TDA1540 DAC pulled out from a Philips CD100. It was in perfect working condition when taken out of the CDP. I was wondering if this can be made to work as a stand alone DAC ? I can build a power supply and I do understand that if at all it works, it will accept only optical inputs. Can it be also made to accept USB inputs ? But I am clueless as how to go about tinkering with this.

Any comments or help will be appreciated. Here are the pictures:

IMG_0891.jpg

IMG_0892.jpg
 
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yogibear

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#3
This will accept only I2S input, not the optical. you can google it for the same subject. people have tried it in the past.
Could you point me to some links ? Thanks.

In other words what would it take to functions as stand alone DAC ? These are ceramic dual TDA1540 and am curious to see how different it sounds.
 

jls001

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#5
I can build a power supply and I do understand that if at all it works, it will accept only optical inputs. Can it be also made to accept USB inputs ?
The DAC chip natively works in I2S data format only. You will need additional modules for SPDIF. I don't know exactly but I guess one each for electrical coax and optical TOSLINK. Similarly you'll need USB receiver board/module to be able to accept USB input from a computer. So the coax module will accept coax input from computer and convert the SPDIF signal to I2S so that it is usable by the DAC chip. Ditto for optical and USB signals. One possible way of simplifying the chain could be to use a Raspberry Pi as player and extract the I2S signal from header of Pi and feed it directly to the input of your DAC.
 

rikhav

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#6
To add to what Dheeraj and jls001 have posted , plenty of amanero and xmos usb boards are available on ebay.com

You will have to go through some threads on diyaudio which unfortunately I am not aware of

Hope this can be of any help to you
 

rikhav

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#7
To add to what Dheeraj and jls001 have posted , plenty of amanero and xmos usb boards are available on ebay.com

You will have to go through some threads on diyaudio which unfortunately I am not aware of

Hope this can be of any help to you
 

yogibear

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#8
Thanks Joshua and Rikhav ! Thats makes sense and simplifies things for me. In fact I have a brand new R-Pi sitting duck and unused. Time to fish it out.

Strange, I never thought I would be mating a modern with one very vintage piece !

Now to power up the above DAC, I should look for porn pics of Philips/Magnavox CDP on the web ?
 

Ravindra Desai

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#9
Yogibear,

For the board that you have, it will not be worth the effort building the peripherals around it. That's my personal opinion.

If you have got some design (schematic + layout) skills:
For Analog In + SPDIF Optical IN + USB In and Analog Out, look here

If you want to know what I have done:
For 2 x Analog In + SPDIF Optical/ Co-axial In (jumper selectable) + USB + Bluetooth + DSP (GUI programmable or pre-programmed) look here

The back panel board is standalone. It needs external 3.3V. It houses the SPFIF Optical and Co-axial connectors and 2 x Stereo RCA sockets and the associated circuitry.

Let me know if you get stuck in whatever approach you take.

Good luck!

Regards,

Ravindra.
 
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yogibear

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#10
Thanks Ravindra. I appreciate your help. I had same notion too if it will be worth trying to make this board function as a stand-alone DAC not because if the sonic impressions would not be worth it BUT the amount of work required to make it function.

What if I have the R-Pi and am fine with playing FLAC files from my pendrives / HDD plugged into the RPi ? Will it be easier job to use above board as a DAC ? The above board does seem to have audio RCA outputs to feed a preamp. Please correct me if I am missing something.
 
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Ravindra Desai

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#11
Hello,

Unless you really want to DIY, the player here for Rs. 1100/- has it all.
I have used the same in my project. The sound is top-class.
USB plays MP3, FLAC, WMA, WAV files. It has Bluetooth that latches on to the source through two concrete walls.
It has auxillary input, FM and comes with a dingy IR remote.
What else do you want, unless you have to have a Digital SPDIF input and conversion to analog?

To answer your question:
Yes, you could use the R-Pi and interface its I2S port with your board.
Check the power supply requirements of your board are met.

Regards,

Ravindra.
 
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