17 Feb
2006
17 Feb
'06
4:39 p.m.
On 2/17/2006 at 10:46 PM ard at p850ug1.demon.co.uk wrote:
I've yet to see a floppy drive that used 220/330
ohm terminators. Every
one I've worked on just has a 150 ohm resistor to the +5V line. It'll
still draw the current if that line is pulled low, though.
You're right--I was thinking of MFM hard drives. But the approximately 4V
dropped through the 150ohms x 8 input signal lines is still about 200 ma, a
signficant current. I note that on the 8" drive specs that I have, max 5v
current is about 150% of typical, so one needs to make sure which number is
being used.
In any case, I'd probably over-design a PSU for one of these rather than
use one that just meets it.
Cheers,
Chuck