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Sender: Brian Davis <bd AT depo2020 DOT com>
Message-ID: <53A5F5FC.4070802@jollyrogerlabs.com>
Date: Sat, 21 Jun 2014 17:15:40 -0400
From: Brian Davis <bd AT jollyrogerlabs DOT com>
Organization: Jolly Roger Labs
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To: geda-help AT delorie DOT com
Subject: Re: [geda-help] Single side only pads
References: <53A1964B DOT 802 AT jollyrogerlabs DOT com> <201406181836 DOT s5IIabnH001842 AT envy DOT delorie DOT com>
In-Reply-To: <201406181836.s5IIabnH001842@envy.delorie.com>
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Reply-To: geda-help AT delorie DOT com

Actually, I would prefer that the soldermask cover those areas, is there 
a way to allow it to cover the pads on the top level but not on the 
bottom level?  This is mostly for aesthetics.

-Brian

On 06/18/2014 02:36 PM, DJ Delorie wrote:
>> I have a board for which most components and traces are on the solder
>> side, but a few need to have pads on the component side, so I would like
>> the ability to have pads only on a single side.  I ran across a
>> discussion from 2005 which suggested the use of very small annular rings
>> plus a coincident SMD pad, is this still the preferred method?  Is there
>> a way to embed this approach in a footprint, or do I need to perform
>> these actions for each board?
> PCB uses "pads" to mean SMT component lands, is this what you mean?
> Or do you mean the copper annulus around a pin?
>
> The only way to have a pin with different annulus sizes on each side
> is to have the "pin" have the smaller size, and use an overlapping SMT
> pad for the larger size.  This can be done in the footprint.
>
> But... if you're using both sides of the board, is there really a
> reason to need to reduce the size of the annulus on the "unused" side?