Construcción de un generador electromecánico para la enseñanza de ondas en cuerdas, utilizando generador virtual para tablet

Abstract

In this work, it is proposed the construction of a simple electromechanical system with a low cost to produce mechanical waves in ropes for the wave physics applications laboratory. This Device consist in a $5''$ speaker transformed with a removed cone, a membrane is added and aluminum axes used to tie a rope and a counterweight at the end of the string, to produce stationary waves. In other hand a 10 W amplifier with a TDA2050 integrated circuit to feed the electromechanical system is constructed. As a wave generator, an App of Android for Tablets is used, it is called ``Frequency Maker Pro''. As a result of the electromechanical oscillator and the Tablet a constant value of the mass per length unit is founded $\mu$ corresponding to $1.185 \times 10^{-3}$ kg/m that is so closed to the average value $1.2 \times 10^{-3}$ kg/m with an 1.25% error.