29 Oct
1998
29 Oct
'98
12:18 p.m.
Yep. Dead right. 12-15v dc to feed a dc-dc xvtr that
produces 9v to run
the NE8392C xcvr chip.
A lot of ethernet cards use a 5V to -9V isolated DC/DC converter for this.
There were two types of these, the epoxy-potted black brick kind (which looks
similar to the transformer modules, but bigger), and the daughterboard type.
One of the most common converters in the latter category was a model made by
TDK. I don't recall the part number, but I have hundreds of these which I
could sell if anyone has a use for them.
Eric