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Idea: Upgrading my DAC Hat
#9
(01-22-2023, 06:25 AM)DRONE7 Wrote: Would you care to post a detailed build thread for that ?
I have an ancient Phillips cd-650 c/w TDA1541 and would be interested to reuse.

It will not work with the TDA1541, which is much more complicated and has greater parts and power supply requirements. On the TDA1387 x 8 module, of the 28 pins, only 7 pins are actually connected (I2S, V+, GND, Left out, Right out).

I can post the pictures of the top and bottom of the board for the TDA1387 x 8 module, if interested. It is very simple. The I/V conversion process is passive. There is no filter on the output. 

It is possible to use upsampling in Moode using SoX up to 384k, but I have found that the native bitrate always sounds better than the upsampled. I think this is due to innaccuracies with SoX, even with the highest quality settings.

When I had a PCM5122 DAC, similar to OP Doobster, I found the best sound quality could be obtained by SoX upsampling to 384kHz. This turns off internal chip oversampling filters. It does require an RPi 3 for stable operation. It might be worth getting a trial use of PGGB. It only does integer upsamples and I think the PCM5122 needs to see 384kHz sampling rate to turn of the internal OS filters. PGGB also needs a fairly powerful computer with a lot of RAM.

I have upsampled a few files using PGGB (performs a windowed sinc function) with over 100 million taps to 16/384, and I cannot hear a difference from the native bitrate file with the TDA1387 x 8 DAC.

The TDA1387 DAC is limited to 16 bits. It can play 24 bits, but truncates the least 8 significant bits. It still sounds great.

The TDA1387 is a very interesting design. The end of the multibit era. It uses continuous calibration of the five most significant bit current sources, so it has 32 current sources and one spare source. Philips multibit DACs are also unique in that they do not use resistors like the Burr Brown DACs, but use active devices to generate the currents.
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Messages In This Thread
Upgrading my DAC Hat - by doobster - 10-19-2022, 04:36 AM
RE: Upgrading my DAC Hat - by HEGOM - 10-19-2022, 08:08 AM
RE: Upgrading my DAC Hat - by the_bertrum - 10-19-2022, 12:14 PM
RE: Upgrading my DAC Hat - by TheOldPresbyope - 10-19-2022, 12:42 PM
RE: Upgrading my DAC Hat - by DRONE7 - 10-20-2022, 06:10 AM
RE: Upgrading my DAC Hat - by hifinet - 01-21-2023, 08:21 PM
RE: Upgrading my DAC Hat - by DRONE7 - 01-22-2023, 06:25 AM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 04:03 PM
RE: Upgrading my DAC Hat - by Tim Curtis - 01-22-2023, 04:19 PM
RE: Upgrading my DAC Hat - by hifinet - 01-23-2023, 03:31 AM
RE: Upgrading my DAC Hat - by chano22000 - 01-22-2023, 11:05 AM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 04:25 PM
RE: Upgrading my DAC Hat - by Tim Curtis - 01-22-2023, 04:37 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 05:28 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 06:44 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 07:07 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 07:25 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 07:50 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 08:13 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 08:42 PM
RE: Upgrading my DAC Hat - by hifinet - 01-22-2023, 09:07 PM
RE: Upgrading my DAC Hat - by DRONE7 - 01-22-2023, 10:10 PM
RE: Upgrading my DAC Hat - by hifinet - 01-23-2023, 12:00 AM

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