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In this work we obtain an exact solution to the Helmholtz equation with initial conditions and bounded periodic solutions. This solution is expressed in terms of the Jacobi elliptic function cn. We use this exact solution as a seed to generate a good approximate analytic trigonometric solution to the Helmholtz equation for small values of the modulus. We solve numerically this last equation and we compare this numerical solution with the analytic solution obtained from the solution of the Helmholtz equation. We also give some illustrative examples.

Soluciones exactas a la ecuación del oscilador de helmholtz para circuitos eléctricos con no linealidad cuadrática