Re: fake PC supplies
- From: Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx>
- Date: Mon, 23 May 2005 16:47:37 +0100
"Adam. Seychell" wrote:
> I'm recently seeing more cheap PC supplies on the market which appear to
> be fake, in that the clammed output power not impossible for the size of
> parts inside. e.g I have a 500W "Shaw" brand ATX supply, and its output
> inductor uses a piddly T106 (26mm OD) core. The 5V is specified at
> 35Amps yet the output inductor winding is 2x1.2mm diam wire and the
> rectifiers for the 5V is a 15Ax2 Schottky device. This is typical for
> these very cheap power supplies. Similarly the 12V @ 18A output uses
> 2x8A diode (STPR1620).
>
> I've also seen several other PC supplies that have completely omitted
> EMC components, and simply used wire links where the CM inductors are
> meant to go. Some PC supplies I've come across have even used standard
> ceramic/polyester capacitors in place of the Y and X2 rated safety
> capacitors.
>
> How do they get away with this ?
a) Probably because no-one actually *needs* a 500W power supply and the
dodgy suppliers know this.
b) Because it's possible to cheat and lie. Enron did this rather
dramatically for example.
Graham
.
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