i bought acheapo linear psu , no grounding ?

[Axelerator]

Hi, i bought a cheap linear lm17 psu for the relay and led side of my nevepulteq  build (had a beefy transformer inside,so i decided to take one of the sec. for audio and the other for the ms matrix with lots of relays)
the audio psu is grounded right at the diodes.
so the psu kit i bought just has ac input and dc output, the only ground i see is the ´-´ rail of the psu output
so i assume if i add no further ground all the rubbish noise creeps through the ms matrix, which is also grounded(audio wise) at the xlr sockets ?
what i can see the switching side has no own ground so this part could left floating ?
i think it is better to ground the psu to the star grounding point at the ac inlet?

many thanks for your opinions !
axel

 

[sodderboy]

Look at the output the same as a battery, with +/- outputs.  No battery has +/ground, because the circuit determines which terminal is the ground.
Connect the - terminal to wherever you have the 0vl from the other supply connected, which is probably your star point.
Mike

 

[Axelerator]

thanks for your fast anwer !
I already grounded - to the star point.

greets, axel