On 05/01/2011 01:19, Dwayne Reid wrote:
> At 05:13 PM 1/4/2011, Nathan House wrote:
>> I went ahead and changed the through hole resistors and capacitors to
>> SMT parts, since several people suggested that I do so.
>>
>> http://www.roboticsguy.com/images/misc/4550_SMD_pcb.png
>>
>> I think I'm going to make it tomorrow, so any last minute suggestions
>> you might have would be appreciated!
> Good move going to all SMD devices.
>
> Question: are you intentionally not connecting the Vdd pin on the USB
> connector?  If so, how do you get power onto the board?  I don't see
> a power connector anywhere.
>
> dwayne
>

I can see a "Pwr Pins" label on the silk, so I assume that's how.=20
Powering from the USB would be (IMHO more) convenient - or providing a=20
jumper for either option, and use external if you are going to need more=20
than 500mA or other voltage levels (for most small PIC projects this is=20
unlikely though, so I think it would be nice to at least have the option=20
of not needing an external power supply)
Only (small) thing I can spot is to be careful the crystal case does not=20
short the traces it sits over, with there being no mask on the board -=20
you could just make sure it's raised a bit (or hand paint some mask on=20
if you have a touch up pen/lacquer or something)
I would maybe make your pad rings a bit thicker for easier drilling with=20
less risk of breaking traces as you look to have plenty of room (the=20
etched holes in the copper can be very small just to use as a drill=20
guide - like 0.5mm or so)
Looks pretty good though, let us know how it goes, if it works okay etc...



--=20
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