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Subject:	Re: [geda-user] Surrounding a component with an island of non-ground
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Look for the menu item: new lines, arcs clear polygons. Perhaps this is the
behavior you are looking for to connect the rects and polys to traces.

It's described more in various tutorials, like the following:
http://hobby-electrons.sourceforge.net/tutorials/gEDA/index.html
On Sep 17, 2014 3:13 AM, "Richard Hughes" <hughsient AT gmail DOT com> wrote:

> Hi all,
>
> I'm designing a double sided PCB that has two giant rect acting as a
> ground planes on both sides, with traces hand-drawn for the signals.
> This works well from an EMI point of view for the digital logic on the
> board. I'm now adding a photodiode array and 24 bit ADC (down to 20nA
> input current) , and want to surround all the signal traces from the
> array to the ADC in an island of common cathode, to avoid any leakage
> currents.
>
> I'm able to join traces to the ground plane using "j", but I'm not
> able to work out how to "join" an island of a polygon to a random
> signal. I guess I'm trying to ask how to "join" random lines with
> random polygons, without drawing a complex digital ground polygon
> around the photodiode array. Ideas very welcome, thanks!
>
> Richard
>

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<p dir=3D"ltr">Look for the menu item: new lines, arcs clear polygons. Perh=
aps this is the behavior you are looking for to connect the rects and polys=
 to traces.</p>
<p dir=3D"ltr">It&#39;s described more in various tutorials, like the follo=
wing:<br>
<a href=3D"http://hobby-electrons.sourceforge.net/tutorials/gEDA/index.html=
">http://hobby-electrons.sourceforge.net/tutorials/gEDA/index.html</a></p>
<div class=3D"gmail_quote">On Sep 17, 2014 3:13 AM, &quot;Richard Hughes&qu=
ot; &lt;<a href=3D"mailto:hughsient AT gmail DOT com">hughsient AT gmail DOT com</a>&gt; =
wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
I&#39;m designing a double sided PCB that has two giant rect acting as a<br=
>
ground planes on both sides, with traces hand-drawn for the signals.<br>
This works well from an EMI point of view for the digital logic on the<br>
board. I&#39;m now adding a photodiode array and 24 bit ADC (down to 20nA<b=
r>
input current) , and want to surround all the signal traces from the<br>
array to the ADC in an island of common cathode, to avoid any leakage<br>
currents.<br>
<br>
I&#39;m able to join traces to the ground plane using &quot;j&quot;, but I&=
#39;m not<br>
able to work out how to &quot;join&quot; an island of a polygon to a random=
<br>
signal. I guess I&#39;m trying to ask how to &quot;join&quot; random lines =
with<br>
random polygons, without drawing a complex digital ground polygon<br>
around the photodiode array. Ideas very welcome, thanks!<br>
<br>
Richard<br>
</blockquote></div>

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