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"Reference" TDA1541A DAC with I2S-BUS architecture
"Reference" TDA1541A DAC with I2S-BUS architecture
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Old 23rd November 2010, 02:56 PM   #331
Malka07 is offline Malka07  England
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Originally Posted by dvb-projekt View Post
So you have set only the AIF/MS switch to the + position, the others to the - position, right?
No i have the others in the middle and the AIF/MS to the right. I will try with all others to the left...and AIF/MS to the right.

I have just tried it...and still nothing.

Last edited by Malka07; 23rd November 2010 at 02:58 PM.
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Old 23rd November 2010, 03:09 PM   #332
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture


So lets measure the voltages direct at the TDAs.

Pin 28 should have +5V
Pin 26 should have -5V
Pin 15 should have -15V
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Old 23rd November 2010, 03:19 PM   #333
Malka07 is offline Malka07  England
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Originally Posted by dvb-projekt View Post


So lets measure the voltages direct at the TDAs.

Pin 28 should have +5V
Pin 26 should have -5V
Pin 15 should have -15V
Oliver this is what im getting

Pin 28 = +4.90v
Pin 26 = -4.70v
Pin 15 = -14.85v
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Old 23rd November 2010, 03:23 PM   #334
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture
Thats in normal tolerance. Could you measure the data frequencies also at Pin 3 of the TDA?
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Old 23rd November 2010, 03:26 PM   #335
Malka07 is offline Malka07  England
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Originally Posted by dvb-projekt View Post
Thats in normal tolerance. Could you measure the data frequencies also at Pin 3 of the TDA?
Sure...do i need to be playing a signal?

With music playing...it varies from 0.02 to 0.03 Khz

Last edited by Malka07; 23rd November 2010 at 03:29 PM.
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Old 23rd November 2010, 03:42 PM   #336
LucasAdamson is offline LucasAdamson  United Kingdom
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Quote:
Originally Posted by Malka07 View Post
Oliver this is what im getting

Pin 28 = +4.90v
Pin 26 = -4.70v
Pin 15 = -14.85v
Those TL431s are pretty inaccurate, with no way to adjust them in this configuration.

But you are getting voltages on the chip, so that's a good start.

When I had this problem, I was getting +5v digital to the X2, but not to the reclocker, due to the coil being broken so please check for voltage on the 74HC02 chips too. Pin 14 should be +5v 1v. To find pin numbers, pin 1 is at the mark, or if no mark it is anticlockwise next to the indent or chip on the end. Then numbers count anticlockwise - so pin 14 is the last one you come to.
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Old 23rd November 2010, 03:55 PM   #337
LucasAdamson is offline LucasAdamson  United Kingdom
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Originally Posted by Malka07 View Post
Sure...do i need to be playing a signal?

With music playing...it varies from 0.02 to 0.03 Khz
That sounds like DMM flutter to me. In other words, that sounds like it could be no signal at all.
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Old 23rd November 2010, 03:56 PM   #338
Malka07 is offline Malka07  England
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Originally Posted by LucasAdamson View Post
Those TL431s are pretty inaccurate, with no way to adjust them in this configuration.

But you are getting voltages on the chip, so that's a good start.

When I had this problem, I was getting +5v digital to the X2, but not to the reclocker, due to the coil being broken so please check for voltage on the 74HC02 chips too. Pin 14 should be +5v 1v. To find pin numbers, pin 1 is at the mark, or if no mark it is anticlockwise next to the chip on the end. Then numbers count anticlockwise - so pin 14 is the last one you come to.
This are the Voltages im Getting Lucas.

Click the image to open in full size.

All other Voltages are 0v
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Old 23rd November 2010, 04:17 PM   #339
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture
Alon,

when i am at home, i connect my Twisted Pear pcb in my circuit. Then we will see...
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Old 23rd November 2010, 04:29 PM   #340
LucasAdamson is offline LucasAdamson  United Kingdom
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Originally Posted by Malka07 View Post
This are the Voltages im Getting Lucas.

Click the image to open in full size.

All other Voltages are 0v
All voltages correct throughout then, measured at chips themselves. That 4.83v is pin 14, the VCC for that chip.

I see you have those tiny reclocker chips in place. Do you have any 74HC02 chips to throw in there, just in case? They're dirt cheap (30p each) and work well.

It does seem from what you've said that the data may not be reaching the TDA chip at all, indicating that the Twisted Pear is not set up properly, or the reclocker chip is not working.

Are your DAC boards v2.2 or v2.3. If v2.2, have you lifted the appropriate pins on the chips or removed the traces, as instructed by Oliver?
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