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Switching Power Supplies A - Z, Second Edition
Switching Power Supplies A - Z, Second Edition, by Sanjaya Maniktala (Newnes), starting at $48.73
Home » Power
Rosewill FORTRESS-650 Power Supply Review
Author: Gabriel Torres
Type: Reviews Last Updated: July 24, 2012
Page: 3 of 11
Transient Filtering Stage
Hardware Secrets Golden Award

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. 

In the transient filtering stage, this power supply is flawless, with two X capacitors and two Y capacitors more than the minimum required, and with two additional Y capacitors and one additional X capacitor after the rectifying bridge.

Rosewill Fortress 650w
click to enlarge
Figure 9: Transient filtering stage (part 1)

Rosewill Fortress 650w
click to enlarge
Figure 10: Transient filtering stage (part 2)

On the next page, we will have a more detailed discussion about the components used in the Rosewill FORTRESS-650.

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