do floppy drives need a switching p/s?

[Dwight Elvey]

Hi
 Most 8 inch drives were originally run from
linear supplies not switchers. It sounds like the
supply you have is big enough to handle the 24 volt load
but as I recall, there was often a surge spec along with
the continuous load value.
 It is unlikely that you could get the additional 5V at 5W
from the same supply. The transformer is most likely sized
for that application. It would actually be easier to use
a 5 volt supply and add some turns to the transformer
to deliver the 24 volt output. Many switchers regulate
the 5 volts by adjusting the power to the transformer.
By just putting a few turns on the transformer and a
rectifier/filter, you would have good enough regulation
to supply the 24V to a drive. You'd just need a little
experimenting with the number of turns to add.
Dwight

>From: "Chris M" <chrism3667 at yahoo.com>
>
>I'm guessing so. Am wondering if the 1.67 amp 24 vdc
>regulated wall warts from BGMicro are sufficient to
>power an 8" floppy drive (NEC FD1165-A). Needs 24 vdc
>@ 18 watts. Would love to devise a circuit to get the
>5 vdc (@ 5 watts) off the same brick, but that may be
>asking too much ;).
>
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