What is a star ground system?

Discussion in 'General Electronics Chat' started by Fobio Design, Jun 2, 2016.

  1. Fobio Design

    Thread Starter New Member

    May 11, 2016
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    Hello-

    Hope you are all having a good day so far. I have a question regarding star ground systems. What is a star ground system? What are the benefits of this system? And how does one go about integrating a star ground system into their circuit? I have attached the schematics of my project.

    Thanks for reading and I appreciate the help!
     
  2. ISB123

    Well-Known Member

    May 21, 2014
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    527
    Its when all ground connections go to a single point.
     
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  3. WBahn

    Moderator

    Mar 31, 2012
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    4,796
    Basically you run all of your ground (or common) connections back to a single point that then has a very low impedance route back to the source. You often do the same with the power side. The details vary a bit depending on if you are talking about power systems versus something like an analog circuit, but the general idea is the same.

    A big advantage, particularly for analog systems, is that the noise associated with the current draw (and variations in the current draw) of one portion of the circuit have a significantly smaller impact on other circuits.
     
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  4. BR-549

    Well-Known Member

    Sep 22, 2013
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    The whole purpose of a star ground is to keep all circuit grounds at the same potential.
    This is accomplished by making sure the ground conductors are the same length.
     
  5. Lestraveled

    Well-Known Member

    May 19, 2014
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    Wrong. It is to minimize one "leg" effecting another "leg". In other words, a star system minimizes voltage transients, generated by one section, from propagating through out the rest of the circuit.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    IOW to prevent ground loops.
    Which also ties in with equi-potential bonding, which mainly applies to electronically controlled machinery and control enclosures.
    Max.
     
  7. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    An example: Suppose you have a preamp with a high gain driving a power output stage delivering a high current to the load.
    If you connect the output load common to a ground line that also is the preamp ground, then the high currents will cause a small voltage drop in the ground resistance at the preamp which will (usually) adversely affect the preamp operation.
    Thus you want the preamp ground to have a ground return to the power supply separate from the output stage ground.
    The power supply becomes the single point (star) ground point.
     
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