X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:content-type; bh=99rOv2n+BJ0w8RP+tF8NIV3qCCBL94L5Xoh7Nbws//g=; b=W35pgcmOQLQKhQ9aSGwLfH5UyDbsrvx/bDc1BcP4VIAMo+VVGxnNHFhnkzw0HYZVsK V+FVJ63hqtVKBNLQbLi66AmJgX9o96q4lmNUR/Zd/o2OUYwiNNBcySpj3YuDrzjETHtR WAB2tK2HfXASGsM5QuwGJ4OGwrfWd2xmIkufS9giV4zME2I29TpLXy9IEpWsUHPoeu5W EjdQWsp1FNYPKWhBdDcrhhr2/zdiD/BXEtZCt5s98lDdLqksXG79v4/NguD81LoGy3jo yAne+kU1FxtcvEP3URdJNsG+Eh8x/f7vFrX7b/eZK1qrZLCtFqgaaJQ3e2P0qQNZ51AA Yx5Q== MIME-Version: 1.0 X-Received: by 10.182.66.16 with SMTP id b16mr9980084obt.49.1410965905927; Wed, 17 Sep 2014 07:58:25 -0700 (PDT) Sender: froggytoad AT gmail DOT com In-Reply-To: References: Date: Wed, 17 Sep 2014 07:58:25 -0700 X-Google-Sender-Auth: sAK4bbfvpA-y1BewhEv5VlRHmYE Message-ID: Subject: Re: [geda-user] Surrounding a component with an island of non-ground From: miloh To: geda-user AT delorie DOT com Content-Type: multipart/alternative; boundary=e89a8fb1f0a29cf4fe05034419d1 Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk --e89a8fb1f0a29cf4fe05034419d1 Content-Type: text/plain; charset=UTF-8 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" 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 > --e89a8fb1f0a29cf4fe05034419d1 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

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.

It's described more in various tutorials, like the follo= wing:
http://hobby-electrons.sourceforge.net/tutorials/gEDA/index.html

On Sep 17, 2014 3:13 AM, "Richard Hughes&qu= ot; <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&= #39;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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