SMPS Negative Power Supply

[prizark]

Hi guys,

I want to use a PC SMPS rated at 280W to power my opamp circuits.
My question is that can I join the ground of the negative supply and
the ground of positive supply, both of them are black wires and
indicates ground (or zero potential?).The -12V is blue wire and +12V
is yellow wire and also planning to use filtering capacitors to make
the SVRR(Suply Voltage Rejection Ration) high.

Thank You,
pirzark

 

[Art]

Without power applied measure the resistance between the indicated ground
wires. if it is common you will find it measures 0 ohms and you will have no
problem joining them. However is they are independent, measures more than 0
ohms, it may cause an issue with ground looping, poor regulation, etc.