[minima] Re: Minima PCB (eagle cad's)
- From: Clark Martin <cmmac@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Sat, 1 Feb 2014 17:14:50 -0800
Clark Martin
KK6ISP
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
On Feb 1, 2014, at 2:45 PM, Mac A. Cody wrote:
> I have some questions about the parts selection for Adrian's
> Arduino controller board. First, what type of package is used
> for the LM1117? It appears to be DPAK, although I am not sure.
> Two leads appear to be of the through-hole type, while the
> voltage output is a tab. Perhaps the voltage output lead is
> not being used. Second, is there a compelling reason for using
> surface-mount devices for the 22 pF capacitors attached to
> the 16 MHz crystal? I can understand that leaded parts would
> introduce inductance, but I wouldn't think that the clock speed
> on the Arduino would be all that critical. There is certainly
> enough board space to use through-hole capacitors where they are
> located.
>
> It would be nice to minimize the number of components with
> specialized packaging in order to reduce cost and increase the
> likelihood of part availability. Perhaps it might not be too late
> to make a couple of "small" changes in Adrian's design with this
> in mind.
If you want to reduce cost and increase part availability go with surface
mount. Through hole is quickly becoming the "odd" part.
And they certainly make for a more compact board without much effort.
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