[sdiy] some disturbing things i've read recently

[Gavin Russom]

well I'm moving along on my modular but I've recently run across a couple of
technical "facts" that have alarmed me because i'd never heard anything
about any of them and am not prepared
1. An IC will not work properly or at all if the power leads are too long, a
possible solution for this is to put a .1 uF capacitor across the power
leads (I imagine this is a filtering cap to suck off any transients that
would be coming through the power lead?) Any body ever run into this
phenomenon?
2. What is a system DAC? I've looked through all my books and can't find
anything about it.
thanks
MYSTIC