I need a quick-n-cheap solution to adding a USB port to a classic CD player.
"Classic" being any CDP with TDA1541A (maybe with a 7220 digital filter) before it.
There are quite a few (cheap and pricey) ready-to-go PCB "kits" from Asia on eBay or Ali/Taobao.
My only concern is the that these kits are made for more-modern DACs that can deal with the "high" data speed these kit converters spit out.
I want something that sounds decent -- but has same data speed as now-classic, e.g., TI PCM2706.
Thx!
"Classic" being any CDP with TDA1541A (maybe with a 7220 digital filter) before it.
There are quite a few (cheap and pricey) ready-to-go PCB "kits" from Asia on eBay or Ali/Taobao.
My only concern is the that these kits are made for more-modern DACs that can deal with the "high" data speed these kit converters spit out.
I want something that sounds decent -- but has same data speed as now-classic, e.g., TI PCM2706.
Thx!
With Ian's PCB (see elsewhere on here) the TDA1541 can handle 384kHz.
Any USB to i2S should work.
I use the DIYINHK one..................
XMOS 768kHz DXD DSD512(DSD1024) high-quality USB to I2S/DSD PCB - DIYINHK
I don't use the DSD part (don't like the sound!) and the 1541 doesn't like 768 but there is no content recorded at 768 as far as I know.
I feed the O/P of this PCB into Ian's PCB and then into two TDA1541's. Wonderful DAC.
Hope this helps,
P.
P.S. No need for the 7220. Will sound better without it.
Any USB to i2S should work.
I use the DIYINHK one..................
XMOS 768kHz DXD DSD512(DSD1024) high-quality USB to I2S/DSD PCB - DIYINHK
I don't use the DSD part (don't like the sound!) and the 1541 doesn't like 768 but there is no content recorded at 768 as far as I know.
I feed the O/P of this PCB into Ian's PCB and then into two TDA1541's. Wonderful DAC.
Hope this helps,
P.
P.S. No need for the 7220. Will sound better without it.
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Ian's PCB?
As far as the DIYINHK (XMOS) pcb, can I simply drop that into my CD player in situ? That is, using three wires (I2S), feed the TDA1541's three I2S pins and I'm ready to go?
Thanks!
I'm barely active here on DIYA lately so I don't know what "Ian's PCB" is.
As far as the DIYINHK (XMOS) pcb, can I simply drop that into my CD player in situ? That is, using three wires (I2S), feed the TDA1541's three I2S pins and I'm ready to go?
Thanks!
Ian's PCB, all details can be found here:-
http://www.diyaudio.com/forums/digi...1541-fifo-universal-i2s-pcm-driver-board.html
You'd obviously need to disconnect the i2S coming from the Transport but then yes, the i2S from the USB PCB could be fed (ideally via 3 say 100 OHM Resistors) into the CD Player, either pre the 7220 to take 'advantage' of the Filtering and Over-Sampling, or, after the 7220 and directly into the TDA1541 giving you a 'Digital Filterless', Non-Over-Sampling DAC.
Either way you need to disconnect the i2S feed coming from the player.
Cheers,
P.
http://www.diyaudio.com/forums/digi...1541-fifo-universal-i2s-pcm-driver-board.html
You'd obviously need to disconnect the i2S coming from the Transport but then yes, the i2S from the USB PCB could be fed (ideally via 3 say 100 OHM Resistors) into the CD Player, either pre the 7220 to take 'advantage' of the Filtering and Over-Sampling, or, after the 7220 and directly into the TDA1541 giving you a 'Digital Filterless', Non-Over-Sampling DAC.
Either way you need to disconnect the i2S feed coming from the player.
Cheers,
P.
I2S to TDA1541A
For the XMOS/DIYINHK pcb, I could not find a datasheet (owner's manual). Is one avail.?
I assume you mean the Ian PCB is limiting BCK to 6.4MHz or below. 6.4 Mhz BCK is max 1541 can take; I use a dedicated 11.289 Mhz clock which has a divide-by-two output.
For the XMOS/DIYINHK pcb, I could not find a datasheet (owner's manual). Is one avail.?
Yes, I think this is what Ian is doing.
Best to have a read of his Datasheet, I would assume it is available on the thread I posted. I have a copy somewhere but not sure I can post it here without Ian's permission.
I think you get a copy when you buy one (?)
Re the DIYINHK PCB, I don't think they publish one on their site but may be worth contacting them and asking. They seemed approachable when I had some questions.
Cheers,
P.
Best to have a read of his Datasheet, I would assume it is available on the thread I posted. I have a copy somewhere but not sure I can post it here without Ian's permission.
I think you get a copy when you buy one (?)
Re the DIYINHK PCB, I don't think they publish one on their site but may be worth contacting them and asking. They seemed approachable when I had some questions.
Cheers,
P.
About the Ian PCB....
Is there a clock built onto that PCB? Or must one bring in a clock/XO signal from an external clock?
I have a couple of dedicated clock circuits -- Tent, Kwackclock, Flea -- that work well. I'd prefer using those.
EDIT:
Nevermind that question ... just found the Group Buys page with iancanada's PDFs and ecosystem catalog.
Is there a clock built onto that PCB? Or must one bring in a clock/XO signal from an external clock?
I have a couple of dedicated clock circuits -- Tent, Kwackclock, Flea -- that work well. I'd prefer using those.
EDIT:
Nevermind that question ... just found the Group Buys page with iancanada's PDFs and ecosystem catalog.
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Can I put a DAC board inside any CD/DVD player and use it for high quality audio?
How do you feed both outputs with one I2S?
That's a bit more complex. A quick look into the manual tells us that in order for Ian's PCB to properly output 384 kHz data stream for TDA1541(A) it needs to be fed with 32x BCLK rate on the input which is quite unusual for most USB => I2S converters. Ian's board would have to further divide the clock by a factor of 2 for 16-bit output, but it just doesn't do that, so the maximum stream with "JHALF" and 64x BCLK on the input is 192 kHz for TDA1541(A).
Would this work?
SA9023 + ES9023 / USB to SPDIF I2S coaxial / DAC Amplifier 24bit 96K | eBay
Has pads for the 12s connections, would just need to make sure there was the required 33r on the receiving end.
SA9023 + ES9023 / USB to SPDIF I2S coaxial / DAC Amplifier 24bit 96K | eBay
Has pads for the 12s connections, would just need to make sure there was the required 33r on the receiving end.
jlsounds USB/I2S board is the best, it can handle many dacs directly
anyway my project contains PCM2706, you can take inspiration from that ... for R-2R dacs where 16b/44.1kHz is enough for you
anyway my project contains PCM2706, you can take inspiration from that ... for R-2R dacs where 16b/44.1kHz is enough for you
You will probably get away with just feeding the I2S to both existing and new DAC pcb (i.e. in parallel.)
Yes that should work, although the listing does not mention the I2S connection so best check that the unfitted pin strip location is for it.
The one that I have used is a smaller board with a usb socket, three clock crystals, and an SA9227. That one has the 12s pads labeled.
There are some on that auction site for around $38, is an orange board I think.
I haven’t used any with the older type dac however.
There are some on that auction site for around $38, is an orange board I think.
I haven’t used any with the older type dac however.
Does anyone know if the new Ian Canada FifoMa can feed the TDA1541A chip directly, as it’s data sheet states its maximum is 384kHz for PCM?
You may still need Ian's I2S to PCM board, which also offers other features such as stopping the clock after the data has been latched.
https://github.com/iancanada/DocumentDownload/blob/master/PCMboard/I2StoPCMconvertorBoardV1.1.pdf
https://github.com/iancanada/DocumentDownload/blob/master/PCMboard/I2StoPCMconvertorBoardV1.1.pdf