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Date: Thu, 28 Feb 2013 12:07:27 -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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On 02/28/2013 12:00 PM, 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?
> 
> Got it
> This was good little practice

  Yes.  Good luck with your board!

             -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA