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Recommended
Switching Power Supplies A - Z, Second Edition
Switching Power Supplies A - Z, Second Edition, by Sanjaya Maniktala (Newnes), starting at $56.35
Home » Power
Amacrox Free Earth 85PLUS 650 W Power Supply Review
Author: Gabriel Torres
Type: Reviews Last Updated: March 29, 2010
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. 

This power supply has two X capacitors and two Y capacitors more than the minimum required plus two X capacitors and one ferrite coil after the rectification bridge, but it doesn’t come with a MOV, which is a sin. This component is in charge of surge protection.

Amacrox Free Earth 85PLUS 650 W power supply
click to enlarge
Figure 7: Transient filtering stage (part 1).

Amacrox Free Earth 85PLUS 650 W power supply
click to enlarge
Figure 8: Transient filtering stage (part 2).

In the next page we will have a more detailed discussion about the components used in the Amacrox Free Earth 85PLUS 650 W.

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