Nebulizer comprising a cup (5) capable of containing a liquid and a vibrating organ (4) capable of emitting, under the effect of a command signal from a control circuit (10), an ultrasonic beam that allows the liquid to be transformed in fog, which also comprises means for detecting (14) the noise produced by the fogging to detect the presence and / or absence of a sound signal from said vibrating organ and / or determine the value of said sound signal, or a signal corresponding to a sound signal from said vibrating organ, characterized in that the detection means comprise a filter connected to the connection between the control circuit (10) and the vibrating organ (4) and capable of providing a corresponding filtered signal to a sound signal and a means of analysis (17) to detect the presence and / or absence of this filtered signal and / or the value of this filtered signal with respect to a threshold (TH) and for mpair the value of said signal filtered with this threshold (TH) in successive predetermined moments of comparison and provide a warning signal when the value of said filtered signal is less than or equal to said threshold a predetermined number of consecutive times.Nebulizador que comprende una copela (5) apta para contener un líquido y un órgano vibratorio (4) apto para emitir, bajo el efecto de una señal de mando procedente de un circuito de mando (10), un haz ultrasónico que permite transformar el líquido en niebla, que comprende además, medios de detección (14) del ruido producido por la nebulización para detectar la presencia y/o la ausencia de una señal sonora procedente del citado órgano vibratorio y/o determinar el valor de dicha señal sonora, o de una señal correspondiente a una señal sonora procedente del citado órgano vibratorio, caracterizado por que los medios de detección comprenden un filtro unido a la conexión entre el circuito de mando (10) y el órgano vibratorio (4) y apto para facilitar una señal filtrada correspondiente a una señal s
