Quantity   Component name
1 × J1 DC Barrel Jack Connector DC Barrel Jack connector for a 9V adapter (positive terminal center)
1 × U1 DIP-8 IC Socket Socket for a NE555P timer IC
1 × C1 100uF Electrolytic Capacitor Charge/discharge capacitor for the astable configuration of the 555 timer
2 × R1, R2 10 kΩ resistor Resistors for triggering and discharging in the astable configuration of the 555 timer
1 × R3 470 Ω resistor Current limiting resistor for the LED
1 × D1 5mm LED Any 5mm LED to visualize the 0.48Hz oscillation
1 × D2 1N4007 Diode Reverse biased protection diode tied to ground