22 Feb
2010
22 Feb
'10
10:03 p.m.
On 22 Feb 2010 at 20:42, Tony Duell wrote:
There's that, but the issue of using a long cable with totem-pole
drivers creates interesting issues with under- and over-shoot. ISTR
that there are situations where a large inductance driven with a CMOS
totem-pole can result in both the pull-up and -down transistors being
momentarily turned on. Clamping diodes could minimize that.
You might get
away with it, but I wouldn't recommend it. Add to the
mix that 8" drive cables are usually much longer than 5.25" or 3.5"
cables (read: higher inductive load) and you have an "interesting"
Isn;'t it the extra capacitance (from the longer cable) that's the
problem? I was going to ask that. What is the problem with
construction an
add-on buffer board, say using 74x07 chips and pull-up resistors, to
interface between the microcontroller/USB interface thingy/... and thr
8" driv
That's exactly what I did--and mounted the thing on a PC-type bracket
with a DC-37F connector on it. Two birds with one stone--an external
drive connector and ample drive capability. For good measure, I
added some schmitt trigger receivers with their own 150 ohm pullups.
--Chuck