[sdiy] New digital synthesis projects under way

[Eric Brombaugh]

John Luciani wrote:
> On Mon, Jun 22, 2009 at 4:15 PM, Eric Brombaugh<ebrombaugh1 at cox.net> wrote:
> 
>> One other caveat - I'm using SMD electrolytics for the first time on this
>> board. I snagged the footprints from John Luciani's site and tweaked the
>> pads to extend out beyond the edge of the plastic carrier in order to make
>> hand soldering a bit easier.
> 
> I am curious how much you extend the pads for hand soldering. I had to
> make a footprint for a capacitance sensor that only comes in an SON
> package. I found that extending the pads 20 - 30mils from the body
> was sufficient (I use a Metcal iron with a 20mil tip). Did you extend the
> pads much more than that?

I extended them 30 mils beyond where they originally stopped which is 
about 20 mils beyond the package outline in the silk layer. That appears 
to be sufficient for the brand of caps I bought that are specified with 
slightly different dimensions than the Panasonic FK parts your footprint 
is based on. I got the Cornell Dubilier AVE caps which are only about 
$0.08/eq in qty 50 from Mouser. They're about 1/2 the cost of others 
which kind of makes me wonder why. Cute little parts though...

Although I did a 'dry fit' on a 1:1 printout, I'll know for sure when I 
get the boards back and actually try it out. :)

Eric