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Switching Power Supplies A to Z
Switching Power Supplies A to Z, by Sanjaya Maniktala (Newnes), starting at $94.17
Home » Power
BFG 800 W Power Supply Review
Author: Gabriel Torres
Type: Reviews Last Updated: February 16, 2008
Page: 3 of 10
Real-time pricing for XFX P1-750B-NLG9.
XFX P1750BNLG9 Pro Series XXX Edition ATX Semi-Modular Power Supply 750W 80 Plus Silver 135mm Fan Active PFC
TigerDirect: $129.99 Newegg: $129.99
CompUSA: $129.99

Transient Filtering Stage
Hardware Secrets Silver Award

As we mentioned on other articles, 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 than that, usually removing the MOV, which is essential for cutting spikes coming from the power grid, and the first coil.

On this section this power supply is flawless, as it has more components than the necessary – two extra X capacitors, two extra Y capacitors and one extra coil.

BFG 800 W
click to enlarge
Figure 8: Transient filtering stage.

On almost all power supplies we’ve seen lately some components from the filtering stage are attached to the power cord connector, which isn’t the case of this power supply.

A very interesting feature from this power supply is that its fuse is inside a fireproof rubber protection. So this protection will prevent the spark produced on the minute the fuse is blown from setting the power supply on fire.

In the next page we will have a more detailed discussion of the components used in the BFG 800 W.

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