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Date: Thu, 28 Feb 2013 11:39:57 -0500
From: Dave McGuire <mcguire AT neurotica DOT com>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] surface mount confusion
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Reply-To: geda-user AT delorie DOT com

On 02/28/2013 11:26 AM, kqt4at5v AT gmail DOT com wrote:
>>> Being a beginner with not so steady a hand I choose to stick to
>>> through hole devices But I just tried a simple board with a soic
>>> chip I made a breakout board for TPIC2810D 1 chip and a single
>>> row header of 16 pins The board is single sided so the chip is on
>>> the solder side and the header is on the opposite side I setup
>>> the board so pin 1 of the chip is connected to pin 1 of the 
>>> header and so on When viewed in pcb the traces appear not be
>>> connected correctly but when I export to gcode they are correct 
>>> Would someone set an old fella straight
>> 
>> I would love to help but I'm not sure I understand specifically
>> what the problem is...can you describe what you mean by "traces
>> appear not to be connected correctly"?
>> 
>>> If I were to try this on a more complex board it would make me 
>>> crossed eyed
>> 
>> Nah...I lay out surface mount PCBs and build prototypes for them
>> all the time.  It's just a different skill set from doing
>> through-hole work. I actually despise through-hole work anymore,
>> and minimize it when possible.  (not just due to the additional
>> assembly cost when a design goes to volume production!)
>> 
> 
> I attached screwed up pcb

  Ok.  At first glance, it appears that the traces are on the bottom
(solder) side of the board...they will of course make contact with the
through-hole header pins, but the footprint for the TPIC2810D is on the
top (component) side of the board...there will be no electrical
connection to them.

  You'll need to either redraw those traces on the top side of the
board, move the chip to the bottom of the board, or use vias to get
those signals up to the top of the board.  Get it?

              -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA