Hi people,
I may be mistaken, but there is a distinction between ground connection and common line.
I believe that the "down arrow" designates a common line connection, which depending on circuit configuration may have the value of 0V, Pos supply or Neg supply or any other value as assigned to the common line in a particular circuit design.
In most cases it is at 0V,connecting at some point to the chassis ground (not always) and the chassis ground links to the external, real world ground ,through the wall socket.
There used to exist different symbols for each of those different "ground levels",even if in the end they connect to the same point.
Also in many circuits a separate symbol is used for analog and digital ground connections,
based on noise considerations.
Dave Kendall <davekendall@...> wrote:
I may be mistaken, but there is a distinction between ground connection and common line.
I believe that the "down arrow" designates a common line connection, which depending on circuit configuration may have the value of 0V, Pos supply or Neg supply or any other value as assigned to the common line in a particular circuit design.
In most cases it is at 0V,connecting at some point to the chassis ground (not always) and the chassis ground links to the external, real world ground ,through the wall socket.
There used to exist different symbols for each of those different "ground levels",even if in the end they connect to the same point.
Also in many circuits a separate symbol is used for analog and digital ground connections,
based on noise considerations.
Dave Kendall <davekendall@...> wrote:
On 8 Jun 2007, at 19:16, Louis van Dompselaar wrote:
> That can't be "instead of". Those are two completely different
> things...
That's what I mean - I've seen some schematics where the down arrow
indicates a connection to GND. Most schemos I've come across show a
down arrow connecting to neg voltage.
there are some schemos on GEOFEX that use a down arrow for GND for
example.
They're indeed not the same, I just wondered why the 2 different ways
of showing a ground connection.
On 8 Jun 2007, at 18:55, Larry T. wrote:
> okay then. I'm not that used to +/- supply layouts. I remember the
> following 'text' diagram as ground:
>
> |
> |
> -----
> ---
> -
Me too....it seems much more common.....
cheers,
Dave
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