• Power Supply: You have a 9V power supply connecting to the circuit.
• $R1$: A 10 kΩ resistor is connected to the power supply.
• $R2$: A 100 kΩ resistor is in series with $R1$.
• Pin 7 (NE555): The junction between $R1$ and $R2$ is connected to Pin 7 of the NE555, which is usually the discharge pin.
• $C1$: A 10 µF capacitor connected to the junction of $R2$ and Pin 7, and the other terminal is grounded.
• Pin 3: This is the output pin, labeled "Salida" in your description, is connected to the load (a coil, or "bobina" in Spanish).
• Ground: The ground connection completes the circuit.

graph TD;
    V9[+9V] --> R1[10 kΩ];
    R1 --> R2[100 kΩ];
    R2 --> C1[10 µF];
    C1 --> GND;
    R1 --> NE555:7["Pin 7 (Discharge)"];
    R2 --> NE555:6["Pin 6 (Threshold)"];
    R2 --> NE555:2["Pin 2 (Trigger)"];
    C1 --> NE555:2;
    NE555:3["Pin 3 (Output)"] --> Load[A Bobina];
    NE555:8[Vcc] ---> V9;
    GND ---> NE555:1[Ground];

• NE555 Pinout:
  • Pin 1: GND (conectado a tierra)
  • Pin 2: Trigger
  • Pin 3: Output (Salida)
  • Pin 4: Reset (conectado a Vcc si no se usa)
  • Pin 5: Control Voltage (generalmente conectado a un capacitor a tierra)
  • Pin 6: Threshold
  • Pin 7: Discharge
  • Pin 8: Vcc (conectado a la fuente de alimentación)

• Para configurar un temporizador astable, necesitarás conectar el pin 2 (Trigger) y pin 6 (Threshold) juntos, que parece ya estar resuelto en tu descripción.
• El capacitor $C1$ junto con las resistencias $R1$ y $R2$ determinan la frecuencia de salida en el modo astable.