| Seventeam ST-380PAS Power Supply Review |
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| Transient Filtering Stage |
 As we mentioned on other articles and reviews, the first place we like to take a look when opening a power supply to have a hint about its quality is its filtering stage. The recommend 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 and the first coil. On this power supply this stage is flawless, with two X capacitors, one X capacitor after the rectifying bridge, two Y capacitors and one ferrite coil more than needed. 
click to enlarge
Figure 7: Transient filtering stage (part 1).
click to enlarge
Figure 8: Transient filtering stage (part 2).
Now let’s have a more detailed discussion on the components used on Seventeam ST-380PAS. |
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