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SMPS Negative Power Supply

Discussion in 'General Electronics' started by prizark, Feb 5, 2004.

  1. prizark

    prizark Guest

    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
     
  2. Art

    Art Guest

    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.
     
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