Sounds like a 5 to 9 volt switching supply.
Rick

Josh Koffman wrote:

> Hi all. So, in my PIC&Ethernet quest, I have aquired a bunch of NE2000
> cards based on the RTL8019AS chip. Some of them clearly have no
> connection to the +12V pin on the ISA bus - a bonus as then all I need
> is +5V. I do have a few cards that the +12V line is connected to though.
> However, they go to a component that I can't identify. I tried chipdir
> and a google search, and although there were some matches, there was no
> ID of what it might be. The closest thing was a product table for
> transformers. Question is, why would a transformer need +12? Anyway, the
> part number seems to be CFUS0509-C. It's a 24 pin wide DIP, and it's a
> big tall block, not an IC.
>
> Any ideas? I know that figuring out what it is won't let me magically
> run the card on +5V, but it would make me feel better knowing why I
> can't :)
>
> Thanks,
>
> Josh
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