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common ground to different dc out put voltages

Discussion in 'General Electronics' started by banu, Dec 9, 2003.

  1. banu

    banu Guest

    Hi all.

    My circuit board needs two supply voltages (5v and 15v ) from
    external power supply .I used two switching regulators ,one of which
    gives 5v o/p with 4amps and other one 15v o/p with 3amps.i have taken
    these voltages as input to the different ic's.i want to know that
    shall i connect the two grounds of the different supply voltages as
    common to the ground in my circuit board.please clear me ,because i am
    not getting the required output voltage.
    Thanks in advance.

    With Regards,
    bhanuprakash.
     
  2. default

    default Guest

    There should be no reason that two independent power supplies can't
    coexist with the same ground - unless power is being sourced from one
    and sicked by the other. Powering IC's on a board with the ground
    reference to the digital and/or analog circuits should present no
    problem.

    Connecting both PS to the same ground on the circuit board is the way
    it is done . . .

    You can't take two power supplies with 5 and 15 and expect them to
    power an audio amplifier that wants to see Plus and Minus 10 volt
    supply rails to ground - that would smoke your speakers (at least).

    What are you really trying to do?
     
  3. banu

    banu Guest

    Dear Sir,

    Let me explain you the problem i am facing ,this may
    take a few minutes to read out ,but please give me a solution to
    this.my application board is in the devicenet network,Actually my
    circuit board requires 3.3v ,for that i have taken 24v dc from the
    devicenet(source of ps) and i used a regulator(which gives o/p
    [email protected] with wide input range 4.7v-25vdc) that converts 24v dc to
    3.3v and gives an output current of 300ma.In my circuit board i have
    differntiated the ground from the devinet(source of ps) to analog and
    digital.when i am measuring the output voltage using an DMM(digital
    multimeter),with DMM +ve terminal placing at output of ic and -ve
    terminal at the ic ground(which is digital ground).i am getting
    1.2v.When placing the DMM -ve terminal at the devinet(source of ps)
    -ve,i am getting a 2v ,what could be the problem.Why i am getting
    differenet voltages by movingthe DMM -ve terminal to two
    locations.Please give me your possible solution to fix the error.
     
  4. banu

    banu Guest

    Dear Sir,

    Let me explain you the problem i am facing ,this may
    take a few minutes to read out ,but please give me a solution to
    this.my application board is in the devicenet network,Actually my
    circuit board requires 3.3v ,for that i have taken 24v dc from the
    devicenet(source of ps) and i used a regulator(which gives o/p
    [email protected] with wide input range 4.7v-25vdc) that converts 24v dc to
    3.3v and gives an output current of 300ma.In my circuit board i have
    differntiated the ground from the devinet(source of ps) to analog and
    digital.when i am measuring the output voltage using an DMM(digital
    multimeter),with DMM +ve terminal placing at output of ic and -ve
    terminal at the ic ground(which is digital ground).i am getting
    1.2v.When placing the DMM -ve terminal at the devinet(source of ps)
    -ve,i am getting a 2v ,what could be the problem.Why i am getting
    differenet voltages by movingthe DMM -ve terminal to two
    locations.Please give me your possible solution to fix the error.

    Regards,
    banuprakash
     
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