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.
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.
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.
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.
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
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.
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.
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?
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?
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.
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.
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
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
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.
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
What is your I/U converter ? a resistor ? what value ?
Philippe
ok, i set it properly
There is a 249 ohm I/V resistor
Unfortunately, I replaced the DAC chips and the clicks and pops are still there.
There is a 249 ohm I/V resistor
Unfortunately, I replaced the DAC chips and the clicks and pops are still there.
Did you answer dddac's question somewhere else?
Could it be something going on around your receiver chip - the filter perhaps?
Could it be something going on around your receiver chip - the filter perhaps?
Have you a pot or a resistor for ref triming ?
A pot can make many pop noise here, with 8 chips !
Philippe
A pot can make many pop noise here, with 8 chips !
Philippe
fluckscapacitor said:
Yes, VR1 1kohms.
I have the same Dac (only 4 chips), and it was generating some pop corn noise, not periodic. I turned the screw of the ref trimmer, and, no more noise. I think that the track of the trimmer is not very good. It could be better to replace this pot with an equivalent discrete resitance.
Try to just turn a little the trimmer, and ear at the same time.
Philippe
fluckscapacitor said:
Other than the less than ideal way the 'ACT161's are connected, there is nothing wrong with the digital side of this dac. Clicks and pops are always going to be a possibilty, it is inherent in the design. There is the clock domain derived from the SPDIF datastream and the one created by the use of a local oscillator and when the difference between the two domains is great enough, there will be clicks and pops.
- Status
- Not open for further replies.