Circuito de Pulso de 120 Segundos

1:02

Aquí tienes una sugerencia para un circuito que genera un pulso de aproximadamente 120 segundos cuando se presiona un pulsador, utilizando un temporizador 555 configurado en modo monoestable. La idea es que al pulsar el SW1 se active el NE555 Timer configurado para generar un pulso cuya duración viene determinada por la ecuación:

\Large T = 1.1 \times R \times C

Para lograr un pulso de 120 s, puedes elegir por ejemplo:

R1 = 1 MΩ
C1 = 110 µF

Esta combinación da:

\Large T = 1.1 \times 1\,000\,000 \times 110 \times 10^{-6} \approx 121\,s

Elementos sugeridos:

Table

Elemento	Función	Valor/Conexión sugeridas
NE555 Timer (U1)	Temporizador (modo monoestable)	Conecta VCC (pin 8) a la fuente de alimentación y GND (pin 1) al Ground. Pin 4 (Reset) a VCC.
SW1	Pulsador para iniciar el pulso	Configurado para forzar el disparo (trigger) en el pin 2 del NE555, llevando el nivel a un voltaje bajo momentáneamente.
R1	Resistencia para el intervalo de tiempo	1 MΩ conectada entre VCC y nodo que conecta los pines 2 y 6 junto al capacitor de temporización.
C1	Condensador de temporización	110 µF conectado desde el nodo (pines 2 y 6 del 555) hacia GND.
Ground	Referencia de tierra	Conecta todas las referencias a GND.

Puntos clave del circuito:

Configuración monoestable:
- Los pines de Trigger (2) y Threshold (6) del NE555 se conectan juntos al nodo de temporización.
- Al presionar el SW1, el pin de Trigger se lleva momentáneamente a un nivel bajo, activando el pulso.
Tiempo de pulso:
- La duración del pulso se establece con el valor de R1 y C1 usando la fórmula $\Large T = 1.1 \times R \times C$ .
- Con R1 = 1 MΩ y C1 = 110 µF, se obtiene un pulso cercano a 120 segundos.
Conexiones adicionales:
- Asegúrate de conectar correctamente el reset (pin 4) a VCC para evitar reinicios no deseados.
- Puedes añadir un condensador de desacoplamiento en VCC para mejorar la estabilidad, y si se requiere indicar visualmente la activación se puede agregar un LED con su resistencia limitadora conectada al pulso de salida (pin 3).

Esta propuesta es la base para iniciar el diseño en Flux. ¿Quieres que te ayude a sugerir agregar estos componentes a tu esquemático?

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Reviews

Ground
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