[sdiy] stupid scope

[NATE!]

> Something else must be wrong here.
> Sometimes I also notice a (very low) 50Hz ripple
> on the trace, even without anything connected.
> It's not big enough to be really annoying,
> but it makes me think.

i actually get that on my scope [dunno about 50hz, i just assumed 60hz]...
and it NEVER happened until i got banana/minigrabber probes for it, but i
haven't had a chance to 'troubleshoot' it yet. all i know is that when you
connect the probes the ripple dissapears [from grounding it no doubt], and
with no probes it is fine. freaky.

- nate