[sdiy] ICs close together in PCB layouts

[jays at aracnet.com]

Dave,

I'd put the bypass caps on all comparators and anything that might use
a lot of current like LED drivers and so.

Happy soldering.
Jay S.


On Fri, 30 Mar 2012 21:55:48 +0100, Dave Kendall
<davekendall at ntlworld.com> wrote:
> Hi all.
> 
> I've read a few times where people advise against butting up IC's
> against each other when laying out a PCB. Obviously it depends on what
> the ICs are, and what they're doing.......
> 
> I'm currently perfboarding a design that's going to be quite dense in
> ICs to fit it all on a reasonable sized board. So far the ±15V power
> rails are being run up the middle between the legs of the ICs. The
> first stage is a TL074, wired as a dual non-inverting summer per side
> (±15V) . The next stage is a simple non-inverting voltage follower on
> each side (±15V), followed by a comparator on each side (GND, +15V).
> Taps are being taken off to the side of the board at various points.
> As the pins neatly line up OUT to IN (mostly) between the summers,
> followers and comparators, is there any potential problem in having
> the ICs close together?
> 100nF bypass caps will be added every 2nd IC or so.
> 
> All signals are audio frequency, and either bipolar ±5V or GND to
> +15V in the comparators. The chain then goes off to a bunch of logic
> ICs running on GND/+15V.
> 
> Any thoughts welcome.
> 
> cheers,
> Dave
> 
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