do floppy drives need a switching p/s?

Fri Feb 17 05:27:52 CST 2006

In article <20060216012335.87648.qmail at web61020.mail.yahoo.com> you write:
>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 ;).

24v 18W is .75 A, well within the stated specs.

5v 5W is 1A, so a liniar regulator would overload the wart, besides
needing to dissipate 19W.

A switching regulator should have no problem doing the 24v to 5v 1A
conversion.  http://romanblack.com/smps.htm has some lower current
examples.

-- 
Blars Blarson			blarson at blars.org
				http://www.blars.org/blars.html
With Microsoft, failure is not an option.  It is a standard feature.