Transient Filtering Stage

As we have mentioned in other articles and reviews, the first place we look when opening a power supply for a hint about its quality, is its filtering stage. The recommended components for this stage are two ferrite coils, two ceramic capacitors (Y capacitors, usually blue), one metalized polyester capacitor (X capacitor), and one MOV (Metal-Oxide Varistor). Very low-end power supplies use fewer components, usually removing the MOV and the first coil.

This power supply has all required components plus one extra X capacitor, four extra Y capacitors and one extra coil. The MOV can be seen between the fuse and the first coil in Figure 10, using a black rubber protection. This stage is identical from Toughpower 750 W. Notice how the X capacitor in Figure 10 brings the “PSH-750” marking on it, indicating CWT’s original model.

Thermaltake Toughpower XT 750W power supplyFigure 9: Transient filtering stage (part 1).

Thermaltake Toughpower XT 750W power supplyFigure 10: Transient filtering stage (part 2).

In the next page we will have a more detailed discussion about the components used in the Thermaltake Toughpower XT 750 W.


Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.