El multivibrador monoestable con 555 entrega a su salida un solo pulso de un ancho establecido por el diseñador (tiempo de duración). El esquema de conexión y las formas de onda de la entrada y salida se muestran en los siguientes gráficos. Ver que el tiempo en nivel alto de la salida de multivibrador monoestable depende de la resistencia R y el condensador C. La fórmula para calcular el tiempo de duración (tiempo que la salida esta en nivel alto) es: T = 1.1 RC (en segundos).
The 555 timer could easily be the most common chip used in DIY electronics projects because it’s small, inexpensive, and very useful.
It’s considered a timer because it can output pulses of electrical current for exact amounts of time. For example, it could be used to turn an LED off exactly 5 seconds after a button is pressed. It can also make an LED blink on and off, or generate higher frequency pulses that will make sound when connected to a speaker.
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