# 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!

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2. ### ISB123 Well-Known Member

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

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3. ### WBahn Moderator

Mar 31, 2012
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5,648
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 Distinguished 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.

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
16,186
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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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