Seventeam ST-550P-AG Power Supply Review

Hardware Secrets Silver Award

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, yellow component on the pictures below) 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 is flawless on this stage, having two more ferrite coils (one of them is behind the printed circuit board in Figure 6), four more Y capacitors (two of them can’t be seen in Figure 6) and two more X capacitors than necessary.

Seventeam ST-550P-AGFigure 6: Transient filtering stage (part 1).

Seventeam ST-550P-AGFigure 7: Transient filtering stage (part 2).

In the next page we will have a more detailed discussion about the components used in the ST-550P-AG.

Author: Gabriel Torres

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.

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