Here is a related chapter from my thesis: Chapter5.pdf.
Apart from the main results involving delay elements, I described a simple way of constructing a
basic nonlinear oscillator starting from individual electronic components.
(The listed references give more ways of building such oscillators.)
D. V. Ramana Reddy, Abhijit Sen, and George L. Johnston
Time delay effects on coupled limit cycle oscillators at Hopf bifurcation
On Thermal Conduction:
-- Computation and electrophysiology of basal ganglia and auditory brain neurons.
-- Neuronal synchrony and disease network models.
-- Dynamical systems and stochastic modeling of collective phenomena in coupled oscillators.
-- Statistical/quantitative modeling, serial correlations, clustering between discrete events.
-- Delay differential and difference equations.
-- Electronic experimental modeling of coupled oscillators.