Quantity   Component name
1 × 555 timer IC Found in the dish on my desk
2 × G30 schottky diode Desoldered from an old HDD PCB
2 × 1nF ceramic capacitor Pried from an old PSU
1 × 68µF tantalum capacitor Desoldered from an old mobile phone
1 × 6.8KΩ resistor Harvested SMD version from an old PSU
1 × Enamelled copper wire Unwound some of those coils from an old PSU
1 × 50KΩ Potentiometer Found in the dish on my desk