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Old 6th November 2006, 01:08 AM   #1
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Default Clicks & pops with TDA1543 x8 DAC?

Hi,

I have a DAC that has 8x TDA1543, the receiver is a CS8414. Audible clicks & pop noise have recently developed. If I play a test tone, the noises occur at intervals such as once every 2 seconds.

Does anyone have advice on where to begin troubleshooting this? I am running it off of a 12V battery

edit: i am pretty sure the noise is in both channels.
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Old 6th November 2006, 01:22 AM   #2
singa is offline singa  Singapore
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Hi,
One of the TDA1543 may be bad.You need a scope to troubleshoot.With 8 X TDA1543 you need to isolate or test them individually.Hope this helps.
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Old 6th November 2006, 03:20 AM   #3
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a couple things i have noticed. The DAC chips are each running off 8.5V!! with a TL431 shunt regulator. Also the 1543 chips get hot, 50-60C
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Old 6th November 2006, 03:24 AM   #4
pixpop is offline pixpop  United States
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It's common for folks to run these DACs at higher than 5 volts. I run mine at 8 Volts, and it works fine.

50 to 60 Celsius sounds too hot though. Are there any heatsinks? Mine don't run nearly that hot.

They do have a reputation for distortion when they overheat. I haven't experienced it myself, but read it in a thread somewhere.
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Old 6th November 2006, 03:26 AM   #5
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are you measuring with a temperature probe? i'm getting 50-53C, so 60C in the case is a close estimate.

i also tried changing one of the values of the shunt regulator resistors so the chips would run on 6V. when i did this and played a 1khz tone, it sounded higher frequency, some kind of distortion. can i not simply just lower the voltage?
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Old 6th November 2006, 07:21 PM   #6
dddac is offline dddac  Germany
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Are you reclocking or straight from the spdif signal ?
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Old 6th November 2006, 08:35 PM   #7
pixpop is offline pixpop  United States
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fluckscapacitor,

I'm measuring with my finger. I can leave my finger in contact with the heat sink indefinitely. It feels comfortably warm, not hot. I have 8 DACs in parallel, with 4 DACs per heatsink.
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Old 8th November 2006, 10:27 PM   #8
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Hi Flucks,

I guess distortion from Hi temperature on DAC would sound as harsh sound first.
If it pops I would look for missing data->check/change the transport (especially if it is a periodic noise) ->then follow the signal (whatever this may mean )

Good luck,
M
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Old 17th November 2006, 01:09 PM   #9
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Does anyone know what to look for when adjusting the bias on the TDA1543? THere are 8 in parallel, and a 1K pot from VREF (pin 7) to ground shared between the chips.
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Old 17th November 2006, 01:41 PM   #10
philbyx is offline philbyx  France
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You have to insure half the power supply (4v in your case) without signal at the output of the stack of 1543.

What is your I/U converter ? a resistor ? what value ?

Philippe
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