[sdiy] ICs close together in PCB layouts

[Olivier Gillet]

> Dave, you should have no problems putting the ICs close together.  The
> layout technique you're describing is exactly how I do mine, and I've never
> experienced any problems.   However, you MUST leave one empty space between
> 14-pin DIPs because this package is actually just as long as the 16-pin
> package -- they just leave extra plastic hanging over the ends of the last
> pins -- so if you try to put two TL074s end to end without a gap, you might
> actually have to sand off the ends (let's just say this was a lesson learnt
> the hard way).

Very important, I've almost got fooled by this once, the Eagle
footprint for DIP14 is shorter than the chip. I leave at least 200 mil
between the first and last pad of a DIP14 and an adjacent non-DIP14
package ; more between two DIP14s. This is still a bit short to allow
easy chip extraction with a tool.

I've been using this "back to back chips, R and C on the sides" for 6
or 7 boards and never had any problem:
http://mutable-instruments.net/shruthi1/build/svf
http://mutable-instruments.net/shruthi1/build/polivoks

Olivier