| GlacialPower GP-PS550BP Power Supply |
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$ Check REAL-TIME pricing for Amazon.com Digitech PS0913B Power Supply for JHE XAS-BM JamMan Whammy EX7 GNX1 RP100-350 RPx400 BP200 Vocal 300 Vx400 EXH VL2 VL4 HarmonyMan TimeBender Musical Instruments RPx40 $ |
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| Transient Filtering Stage |
As we mentioned on other articles, 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, which is essential for cutting spikes coming from the power grid, and the first coil. Even though this power supply from GlacialPower has one more component than the necessary – one extra X capacitor –, it doesn’t have a MOV, which is a sin. 
click to enlarge
Figure 5: Transient filtering stage (part 1).
click to enlarge
Figure 6: Transient filtering stage (part 2).
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