Humming Servo?

[kresty]

MCK-Y is having trouble with his steering servo & audio, I'm hoping folks have suggestions.  Maybe Lara just needs a stronger servo?

Since he's so heavy, the steering servo can't always shove the wheels over, so it keeps fighting and "hums".  If she wiggles him a little so the servo stops struggling, then its all happy.

The worse part is that the servo hum makes it into the audio channel and amplified.  If I unplug power & Arduino to the MP3 trigger, then the hum goes away.  (Of course then it won't play either).  I tried putting a monster cap across the power input, but that made it worse if anything.

Thoughts?  Obviously when it's stalling it also consumes a bunch of extra power, so maybe I should just get a bigger servo, however I assume Lara can manage to stall anything, in which case it might be nice to understand other ways of mitigating the interference....