Simple 555 Timer Circuit to Blink an LED Continuously 

To make an LED light blink continuously using a simple circuit, you can use a 555 timer IC in astable mode. Here’s how you can do it:

Materials Needed:

• 1 x LED

• 1 x 555 Timer IC

• 2 x Resistors (R1: 1kΩ, R2: 10kΩ)

• 1 x Capacitor (C1: 10µF)

• 1 x Power source (5-9V battery)

• Breadboard and connecting wires

Circuit Design:

1. Connect the 555 Timer IC:

   • Pin 1 (GND) to the ground of the power source.

   • Pin 8 (VCC) to the positive terminal of the power source.

   • Pin 4 (RESET) to VCC (to keep the IC enabled).

   • Pin 5 (Control Voltage) connect to a capacitor (typically 0.01µF) to ground for stability, though this is optional.

2. Configure Astable Mode:

   • Connect Pin 2 (Trigger) and Pin 6 (Threshold) together.

   • Connect Pin 2 and 6 to a junction point with R1 and C1.

   • R1 connects to VCC, and C1 connects to ground.

   • R2 connects between Pin 6 and Pin 7 (Discharge).

3. Add the LED:

   • Connect Pin 3 (Output) to the LED (long leg of the LED, positive).

   • Connect the other leg of the LED to a resistor (330Ω) and then to ground.