Hello,
I got this smps for my l12-2
https://a.aliexpress.com/_EuE444c
The thing is that it does not have any ground connection on the dc side so i grounded my amp boards and speaker output to the socket.
Everything is silent until I turn my dac on. When i do that, i get a hard buzzzz
When i connect my tablet instead of the dac everything is silent. In Guess have a ground loop with the dac.
My question is finally how can I ground the dc side? (Speaker negative and board ground)
Thanks
I got this smps for my l12-2
https://a.aliexpress.com/_EuE444c
The thing is that it does not have any ground connection on the dc side so i grounded my amp boards and speaker output to the socket.
Everything is silent until I turn my dac on. When i do that, i get a hard buzzzz
When i connect my tablet instead of the dac everything is silent. In Guess have a ground loop with the dac.
My question is finally how can I ground the dc side? (Speaker negative and board ground)
Thanks
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The power supply you're using is a single rail supply. "Ground" is the V- terminals. This seems to be common convention with switching supplies. Don't ask me why 🤷♂️. Unfortunately it's useless for your application.
Thanks @thirdicomplex ,
I guess it's going back where it came from...
And now I know what to look for.
Thanks again
I guess it's going back where it came from...
And now I know what to look for.
Thanks again
It is designed (the SMPS) not to have any ground connections between the DC-out negative terminal, and the mains ground (earth) pin.
The amp PCBs, if powered up by that SMPS, are grounded to the SMPS DC-out negative terminal. That's it.
Depending on the amp PCB design/type, the speaker negative may not be allowed to be grounded, i.e. it may have to be left floating.
Hello @Extreme_Boky ,
So i tried leaving the speaker ground floating but I loose power and dept in the sound.
So it is a no go.
I will send itback and get a proper one with 0 point between + and -
So i tried leaving the speaker ground floating but I loose power and dept in the sound.
So it is a no go.
I will send itback and get a proper one with 0 point between + and -
This is possible, IF there is NO connection between the earth pin on the primary side and the ground(V-) pin on the secondary side. You need to check for continuity between these two points.
Ok, you should be good to go then. I would personally perform the first power up through a surge protector with a switch, just in case. But I'm a scaredy cat, YMMV.