Animations: Showing effect of shared external inhibitory input on spike times of a phase locked spike pair
when the neuron pair is coupled with
mutual excitation (STN neurons) or mutual inhibition (HH neurons).
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