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Old 7th March 2008, 02:54 AM   #1
Zigis is offline Zigis  Latvia
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Join Date: May 2005
Location: Riga, Latvia
Default Help with TDA1543 DAC !

I made my first DAC on breadboard and it don't work.
I made few changes, compared to attached schematic. I use CS8414, instead CS8412, with 2 x LM7805, one for digital part and one for analog. And i have simple wires in 22 ohm resistors place.
I try it with cheap DVD, in settings I try both SPDIF/PCM and SPDIF/RAW, no audio output in both.

I check all voltages on all power pins are correct, on AOR and AOL is about 5V, on VREF 2V, on BCK 4.9V, on WS sometimes 0, sometimes 2-3V, on DATA 0V. I disconnect 3 wires from CS to DAC and turn in, on all 3 DAC input pins - 1.2V, on CS output 0.

wen DAC is on some time, LM7808 and DAC chip are litle warm, 5V regulators is cold.

I check all solderings few times, all is correct. What can I check more?
Are CS8414 different from 8412?
Are 22ohm important? I see somewhere schem without it.
Maybe DVD have not digital signal at output?
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Old 7th March 2008, 04:41 PM   #2
JeroenR is offline JeroenR  Netherlands
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Picture would help.

I made a TDA1543 DAC this week with Twisted Pear receiver and DAC on separate board. It did not work at first as there was no connection between the DAC ground and receiver ground as I used two supplies. After connecting the grounds I had music.

But again..... picture would help.

Good luck,

Jeroen
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Old 7th March 2008, 09:49 PM   #3
Zigis is offline Zigis  Latvia
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Pics attached.

Are CS8414 differ in connection to CS8412 ?

How can I qualify receiver chip work or not ?
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Old 7th March 2008, 09:51 PM   #4
Zigis is offline Zigis  Latvia
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One more
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Old 7th March 2008, 09:53 PM   #5
Zigis is offline Zigis  Latvia
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Other side
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Old 7th March 2008, 10:27 PM   #6
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You need to add what is commonly known as an "idi0t light". It will light up when locked to the SPDIF signal.
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Old 7th March 2008, 10:33 PM   #7
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Default grounding issue?

if ur voltage regulators are cold that means they are not working properly... if they are not grounded properly it probably just shoots out whatever input voltage as its output... are all ur components grounded properly?
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Old 7th March 2008, 10:55 PM   #8
Zigis is offline Zigis  Latvia
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rfbrw, any link to this "idi0t light"? Are I understand right, it show me, are digital signal on DVD player or not.
BTW, which settings I need in DVD - spdif/pcm or spdif/raw ?
Are there way to now, are on receiver output signal - where is error, in CS or in DAC.


jayang727, I think all grounding is correct. I use 12V regulated PS, on pins 7, 22 and 24 I have 5V on DAC's pin 5 - 8V.
I check all voltages and ground on pins 8, 13, 17, 18, 21 and 23 before installing chips in sockets.
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Old 8th March 2008, 07:38 AM   #9
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Default PCM

on related note.. i dont think CS8414+tda 1543 dac works with spdif PCM...
not sure
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Old 8th March 2008, 10:26 AM   #10
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Quote:
Originally posted by Zigis
rfbrw, any link to this "idi0t light"? Are I understand right, it show me, are digital signal on DVD player or not.
BTW, which settings I need in DVD - spdif/pcm or spdif/raw ?
Are there way to now, are on receiver output signal - where is error, in CS or in DAC.
The CS8412/4 has two pins that go high in the event of an error. Pin 25, ERF will go high when there is an error. Pin 28 VERF will also go high in the event of an error but as it is logically OR'ed with the validity bit it will also go high if the data is not LPCM, i.e. AC3 data or MP3 data.
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