Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board - Page 64 - diyAudio
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Old 13th December 2013, 11:26 PM   #631
Ben Mah is offline Ben Mah  Canada
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Quote:
Originally Posted by Ceglar View Post
Thanks, Ben.

Yes, to AUX light, and grounds from PCM to the DAC, also JOB and tried also in half speed mode.

MCLK from the the XO board should be connected to the PCM board? - I wasn't using that connection with XO via I2S so I omitted it this time as well. In other words its not connected.

I was getting all three lights on the PCM board to light.. but now no I2S.. I suspect I fried it somehow with my power ups/downs and reconnections (I was wearing a ground strap but who knows).

I'll connect MCLK from XO to PCM and hope for the best. If that fails I'll switch back to I2S to confirm that PCM is fried.

Thanks again.


Shane
Hi Shane,

Yes, the MCLK from Clock board to PCM board connection needs to be made with a u.fl cable. The MCLK signal is required by the PCM board. What is strange is that the AUX led was on but MCLK was not connected. According to the User's Guide, the AUX led lights up on startup only if the MCLK signal is present.

If the I2S led does not light up, then the PCM board may not be receiving the I2S signals. Does the fifo "lock" led light up and is the fifo "empty" led off? Are you sure the PCM board is receiving the I2S signals? I know that I have inadvertently disconnected something upstream when troubleshooting a problem and then not realising that and then spending some frustrating time trying to find out what was wrong.

Good luck.

Ben
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Old 14th December 2013, 06:47 AM   #632
Ceglar is offline Ceglar  Australia
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Thanks, Ben.

Yeah, all three lights where on. AUX included without MCLK.

FIFO locks, end empty LED off.

Something changed when the I2S light stopped on the PCM board.

I'll run PCM board straight from waveIO to verify PCM board functionality, bypass FIFO and isolator completely - easiest way will be to use the un isolated WaveIO uFl connectors.

Suspect I have either fried PCM or isolator. Hopefully Dual XO is OK. Fifo gets lock so assume its ok.

Seems I was so close :-)

Regards
Shane
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Old 14th December 2013, 09:02 AM   #633
Ceglar is offline Ceglar  Australia
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Thanks again Ben.

Dear Mr. Ian,

Running PCM board from WaveIO un isolated I2S plus MCLK distorted sound, low level.

Measuring voltage at PCM board I2S input is 1.6V sort of thing. Voltage at DAC chip pins 1 - 4 is super low, 0.8V. I did measure 3.3V when I first installed it, its not a faulty unit - i somehow managed to kill it. :-( (ok, or maybe it just died).

Not wanting to give up on PCM just yet, Ian can I please buy another board?


Sincerely,
Shane
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Old 15th December 2013, 05:20 AM   #634
Ceglar is offline Ceglar  Australia
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Back to I2S to 1541A = distorted.

Changed amplifier = Music.

Re-instated I2S to PCM board and all adjustments, same Music.

There were some LF oscillations whilst running without MCLK - looks like I took out the transistor amplifier, or some part of it.

Maybe the WaveIO through to 1541A is actually ok - I don't know, still low voltages at DAC chip inputs. Had seem 3.3V there before, its like 0.8V now but it works - kind of.

Some oscillations and DC sounds on substitute amplifier pot, measured DC at output of coupling caps. Seems running without MCLK can really do some damage. Need to replace analog output stage (passive I/V ecc88 ccs loaded RC out)

Question for those who might know, could oscillations be to do with digital side of things as well as analog, or purely analog domain?.

Remaining hopeful.


Shane
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Old 16th December 2013, 06:42 AM   #635
Ceglar is offline Ceglar  Australia
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All good.

Got my hands on a new old transistor amplifier and replaced the output stage coupling caps.

Some HF oscillations notable with volume pot at half position with no signal playing, touching caps/tube/CCS lead-in make squelching noises.. don't know yet but it sounds that good when its cranked that I'm sure the digital side simply must be functioning properly.

Thats an old 70's NAD receiver with some old Jensen speakers. They sure never sounded better.

Using Audirvana and the 45.xx and 49.xx clocks with Dual XO running from WaveIO, I can only go so far as 192kHz without massive distortions, but you know what?.. it doesn't matter, it sounds good enough as it is, really good. I'm calling it a day and going to try and fit it all in a box.



Regards,
Shane
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Old 2nd May 2014, 10:12 AM   #636
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Hi all,

if anyone was interested in the custom Laptech crystal
Ian asynchronous I2S and S/PDIF FIFO KIT group buy
please add your name in the wish list at
Any good TDA1541A DAC kit?

The minimum orderable quantity from Laptech is 5 pcs for each frequency.
When that quantity will be reached I ask Laptech for a quote.

Andrea
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Old 2nd May 2014, 03:53 PM   #637
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Quote:
Originally Posted by andrea_mori View Post
if anyone was interested in the custom Laptech crystal

The minimum orderable quantity from Laptech is 5 pcs for each frequency.
When that quantity will be reached I ask Laptech for a quote.

Andrea
Dear Andrea:
Which models of Laptech were you looking at? XOs or just straight crystals? (I'm not interested in OCXOs)
I have not been able to find any phase noise graphs or specs on their crystals. Do you have something to share that shows they are more special than something nice from say NDK?
Thanks,
AJC
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Old 2nd May 2014, 04:02 PM   #638
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Quote:
Originally Posted by Superdad View Post
Dear Andrea:
Which models of Laptech were you looking at? XOs or just straight crystals? (I'm not interested in OCXOs)
I have not been able to find any phase noise graphs or specs on their crystals. Do you have something to share that shows they are more special than something nice from say NDK?
Thanks,
AJC
You cannot find the specs on the Laptech website, since it's a custom crystal.
It's an AT-cut crystal (not suitable for OCXO) follow the specs for a 11.2896MHz:
cold welded
HC43/U package
10 ohm ESR or less
Q around 150K
strong polished
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Old 14th June 2014, 10:06 AM   #639
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Hello Ian,

Hope you are well!

I am assisting a fellow Australian in connecting up the i2stoPCM to a TDA1541 ... I had a look at your PCB layout in post 242 and noticed the silkscreen in the manual for DCOUT/GND on TP9/TP1 appears to be back to front. He has the boards so I dont have one handy to poke at, could you confirm the polarity for the connection to the isolator board from these test points? I think TP9 should be +ve output rather than GND.

I also noticed that these connections are not mentioned in the manual, would be handy to have them mentioned if ever a new revision to the i2s to PCM converter manual is released.

Regards,
Chris
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Old 15th June 2014, 07:05 AM   #640
Zoran is offline Zoran  Serbia
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HI Ian
could You set by the code line
for 14bit stopped clock for TDA1540 dac?
maybe instead of 18bit pin conn?
Same like for the TDA1541A in COB format, but only 14bit bit-clock pulses from MSB

I think that is not complex operation, just exchanging the software variable from 16 to 14? Or I am wrong?
thanks
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