Abstract: The correspondence between electrical and mechanical parameters is well known. We build a LC circuit and use the oscilloscope to show the process of electromagnetic oscillations, as a result, it gives a clear phase diagram of viscous damping. Furthermore, circuit simulation can also give a phase diagram of frictional damping with Zener diodes. It is instructive in the teaching process to find the corresponding circuit simulations in solving mechanical problems.

Key words: spring oscillator, LC circuit, phase diagram, frictional resistance, Zener diode, circuit simulation