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+--- Thread: ProtoDAC TDA1387 X8 project (/showthread.php?tid=5531)
RE: ProtoDAC TDA1387 X8 project - Rio1969 - 05-10-2024
(05-10-2024, 12:16 AM)hifinet Wrote: There should be no noise. You can double check your solder connections.Will do.
RE: ProtoDAC TDA1387 X8 project - Rio1969 - 05-10-2024
It turns out that the noise was from my headphone amp. It is one that I don't normally use, it is the only one that I have with RCA inputs. I tried the Protodac with my main speaker system and there was no noise.
RE: ProtoDAC TDA1387 X8 project - v12nut - 05-12-2024
(05-09-2024, 11:47 PM)hifinet Wrote: Noise is almost always caused by a bad module.
What does that sound like? earth hum? crackle? I ask because I have an Hum and am trying to figure it out
RE: ProtoDAC TDA1387 X8 project - hifinet - 05-12-2024
The noise from a bad module is usually an intermittent buzz. The bad module can be unusually sensitive to picking up wifi noise.
RE: ProtoDAC TDA1387 X8 project - v12nut - 05-12-2024
(05-12-2024, 02:32 PM)hifinet Wrote: The noise from a bad module is usually an intermittent buzz. The bad module can be unusually sensitive to picking up wifi noise.
Thanks, in my case its probably earth related.
RE: ProtoDAC TDA1387 X8 project - OnkelPH - 05-13-2024
@hifinet what’s the output gain of the ProtoDAC?
RE: ProtoDAC TDA1387 X8 project - hifinet - 05-13-2024
With the 420R I/V resistors at 5V supply voltage, output is measured at about 1.3V RMS with a 0dB sine wave. That is1.84V peak to peak. Consumer 0dBV is 1.414V Ref level. That is +2.28dB. Not sure about the calculation.
RE: ProtoDAC TDA1387 X8 project - OnkelPH - 05-14-2024
(05-13-2024, 09:50 PM)hifinet Wrote: With the 420R I/V resistors at 5V supply voltage, output is measured at about 1.3V RMS with a 0dB sine wave. That is1.84V peak to peak. Consumer 0dBV is 1.414V Ref level. That is +2.28dB. Not sure about the calculation.
Thanks
RE: ProtoDAC TDA1387 X8 project - bobdcarr - 05-29-2024
I am offering my protodac unit. It has SPDIF / Optical inputs and works great. If anyone is interested, please PM me, Bob.
[attachment=3817]
Refer to this post for more info: https://moodeaudio.org/forum/showthread.php?tid=5531&pid=53694#pid53694
Lampizator on ProtoDAC TDA1387 X8 - thomaschan - 06-12-2024
I have added a tube output stage to the 1387 DAC and the improvement is HUGE! The design is based on Lampizator published years ago before he started selling US$50K tube DAC. Very simple and easy to DIY.
https://www.youtube.com/watch?v=z_XzmpK62pc