We observe on-off intermittency in a nonlinear electronic circuit tune
d near a Hopf bifurcation point. The circuit is driven randomly throug
h the bifurcation point, resulting in intermittent switching between a
fixed point (laminar phase) and a limit cycle. The distribution of le
ngths of laminar phases exhibits -3/2 power law scaling for shorter ph
ases, and an exponential drop for longer phases, due to noise in the s
ystem. These results agree with a theoretically predicted distribution
. In addition, the crossover from power law to exponential decay obeys
the predicted scaling law.