Youre very welcome. Great result. Thanks for the fascinating trip. Pity you didn't learn anything about rational problem solving for your years ahead. Good thing your wife's a genius.
Of course that device wouldnt work for your issue. If you had read the first page you could have worked that out in 10 seconds.
Unfortunately the way things are now you are susceptible to have a higher noise floor that may be nasty with appliances switching on or even a neighbour pumping solar into the grid. The solution is still on the first page.
For anyone from the future with the same issue there are some gems in this thread from expert minds that will sort you out.
Ideallly, this kind of issue is best solved upfront, before you notice problems, but it can be solved afterwards in some cases.
Here is an example of how to do it:
https://www.diyaudio.com/community/...-any-brick-or-module-smps.341519/post-5885207
Here is an example of how to do it:
https://www.diyaudio.com/community/...-any-brick-or-module-smps.341519/post-5885207
A lot of good reading here. Definitely smps in computers can be a pain. Being a ham operator, most hams simply avoid computers near their equipment to avoid the noise. I remember a few years ago building a regulated power supply that eliminated all PC noise making it possible to use some digital modes linking laptop with radio. Unfortunately, I'm off to work so I'll finish up the reading later tonight. Thanks.
If the key that holds the secret is buried somewhere in the first page, wouldn't it had been easier to just spell it out and helped me? I'd also like to think everyone's suggestion was valid.
Thanks for your curiosity. My understanding is the first page doesn't have any secrets and nothing is buried. Its all spelled out. While different posts have different angles the first page has everything printed to diagnose and cure the issues.
In threads its usually the case that the original poster appears to ignore good advice. We all have our own views. I think its important to respect peoples right to make their own way. It can be hard on some of our experts here (I have no expertise at all myself) who are trying to help and save someone needless grief.
Greetings kazap,
Is this the "USB toslink XMOS XU208" you were referring to in this post? I am encountering similar issues as the OP: there's a constant (and audible) hum due to the laptop power supply.
A short description of my setup (pls forgive me for the absolute cheapness of it): HP laptop using a Type C PSU --> the tiny Type C Apple dongle DAC (right next to the charging port!) --> Class D Aiyima A07 amp (RCA input) --> Speakers. I don't believe the laptop PSU has a ground prong.
I first noticed the humming during night listening sessions (when it's really quiet), and unplugging the PSU is the only way to eliminate (or reduce) it. I do believe it's some kind of ground issue because when I touch any exposed metal part on the laptop with my bare skin it goes away.
So I'm trying to find a way to isolate the DAC from the laptop, or switch to a new one entirely. I just need to connect to the RCA inputs on the amp, no need for BT or anything fancy. I can allot about 30-40$ ish (money is somewhat tight).
Best regards,
K.
SMPS in combination with computer audio are both fantastic, great and unbeatable. They are cheap (to some the most important parameter), if one is lucky they also generate EMI and hum, they are easy to use and…..
They generate many new issues and therefor many people asking to solve those in new threads.
Conclusion: SMPS and computer audio are good content creators.
Wonderful!
They generate many new issues and therefor many people asking to solve those in new threads.
Conclusion: SMPS and computer audio are good content creators.
Wonderful!
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Jean,
Yes, they are, in this case, they revived an old thread 😳
If I will be crucified for using a dongle instead of a real DAC with separate power supply, so be it. What are my options right now?
K.
Yes, they are, in this case, they revived an old thread 😳
If I will be crucified for using a dongle instead of a real DAC with separate power supply, so be it. What are my options right now?
K.
I have a Vintage NAD C320 which has a 100 ohm resistor and 10n cap between circuit ground and chassis. I found it in the corner of the main board next to the volume control when it smoked. Maybe your amp has something like that.
Just get an external sound card , I have an ASUS U7 mk2 . I power it with external 5v supply. No noise , no hum - perfect.
I have special USB cord that allows this. It does have optical , but I was to cheap to buy the cord. Even in this case , I'd still have to have USB
to interact with this sound card.
OS