[sdiy] ICs close together in PCB layouts

[Dave Kendall]

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