200ms Pulse Circuit Design

flux

0:57

Aquí tienes un ejemplo de circuito únicamente con componentes analógicos que genera un pulso de ~200 ms al presionar un botón, sin utilizar componentes programables:
Circuito Monoestable con NE555
Componentes necesarios

Table

ComponenteValor/Recomendación
Temporizador NE555NE555 (por ejemplo, U1)
Resistencia para tiempo (R)Aproximadamente 18 kΩ (puedes ajustar a 18 kΩ estándar)
Condensador para tiempo (C)10 µF
Botón pulsadorPush-button
Resistencias de pull-up(por ejemplo, 10 kΩ en el trigger, opcional)
Condensador de desacoplamiento0.01 µF en el pin de control (pin 5)
Configuración del circuito
  1. Alimentación y Reset:
    • Conecta el pin 1 del NE555 a GND.
    • Conecta el pin 8 a la fuente de voltaje (VCC, por ejemplo, 5 V).
    • Conecta el pin 4 (Reset) directamente a VCC para evitar reinicios no deseados.
  2. Disparo (Trigger):
    • Conecta el pin 2 (Trigger) a un botón pulsador que, al cerrarse, conecte el pin a GND.
    • Agrega una resistencia pull-up (por ejemplo, 10 kΩ) entre pin 2 y VCC para mantenerlo en alto cuando no se presiona el botón.
  3. Configuración Monoestable:
    • Une el pin 6 (Threshold) y el pin 7 (Discharge).
    • Conecta una resistencia R = 18 kΩ entre VCC y los pines 6-7 unidos.
    • Conecta un condensador C = 10 µF entre los pines 6-7 y GND.
  4. Filtro del Pin de Control:
    • Conecta un pequeño condensador (aprox. 0.01 µF) entre el pin 5 (Control Voltage) y GND para filtrar ruidos.
  5. Salida:
    • El pin 3 (Output) entregará el pulso de aproximadamente 200 ms luego de activar el disparo.
Cálculo del Tiempo de Pulso
El tiempo de pulso para una configuración monoestable con NE555 se determina con:
T=1.1×R×C\Large T = 1.1 \times R \times C
Con R = 18 kΩ y C = 10 µF:
T≈1.1×18,000×10×10−6≈198 ms\Large T \approx 1.1 \times 18{,}000 \times 10 \times 10^{-6} \approx 198\ \text{ms}
Esto se aproxima a los 200 ms requeridos.
Funcionamiento del Circuito
  • Reposo: El pin 2 (Trigger) se mantiene en alto gracias al pull-up.
  • Disparo: Al presionar el botón, el pin 2 se pone momentáneamente en bajo, activando el NE555 en modo monoestable.
  • Pulso de salida: El NE555 genera un pulso en el pin 3 que dura aproximadamente 200 ms (dependiendo de la tolerancia de R y C). Luego, el circuito se reinicia y queda listo para un nuevo disparo.
Este diseño utiliza el NE555, un componente analógico clásico, proporcionando la funcionalidad deseada sin necesidad de microcontroladores ni elementos programables. Si deseas ajustar la duración del pulso, puedes modificar los valores de R o C según la fórmula dada.
Si necesitas más detalles o alguna aclaración, ¡hazme saber!
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LED1
SW1
R1
Resistance
18kΩ
R2
Resistance
10kΩ
U1
C2
Capacitance
10uF
V1
R3
Resistance
330 Ω
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