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Date: Thu, 28 Feb 2013 11:00:43 -0600 (CST)
From: kqt4at5v AT gmail DOT com
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Subject: Re: [geda-user] surface mount confusion
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On Thu, 28 Feb 2013, Dave McGuire wrote:

> 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?
>

Got it
This was good little practice

Thanks
Richard